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Enhancing polishing property of CeO2-based abrasives by co-doping with lanthanide and fluorine 认领 引用
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作者 Guangda Han Tian Xing +5 位作者 Dingai Xiang Min Cao You Xue Ziyu Yang Jilei Zhu Junjie Xu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第7期2186-2194,I0007,共9页
The development of CeO2-based abrasives that simultaneously deliver faster processing speeds and smoother surfaces remains a significant challenge for semiconductor polishing applications,as it is difficult to make... The development of CeO2-based abrasives that simultaneously deliver faster processing speeds and smoother surfaces remains a significant challenge for semiconductor polishing applications,as it is difficult to make further progress by optimization of solely Ce3+content or particle size.In this work,we engineered lanthanide and fluorine co-doped CeO2-based abrasives to concurrently optimize both particle size and Ce3+content.Fluorine doping effectively reduces the particle size to approximately50 nm while simultaneously enhances the Ce3+concentration.Synergistic optimization is achieved in Fdoped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives due to the additional enhancement of Ce3+content and generation of rare earth oxyfluorides,which can promote the polishing efficiency.Notably,F-doped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives show material removal rates of 540.42 and 789.15 nm/min,which are 1.57 and 2.3 times that of CeO2.K9 substrate polished by F-doped Ce0.8La0.2Oxand Ce0.8Pr0.2Oxabrasives exhibits an average surface roughness of 0.091 and 0.018 nm,which are lower than 0.337 nm achieved by pristine CeO2.The results offer guidance for the design and preparation of highperformance CeO2-based abrasives. 展开更多
关键词 CeO2-based abrasives Particle size Ce3+content Synergistic effect Co-doping Rare earths
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Modulation of wettability and interfacial reaction between DZ125 superalloy and Al2O3-based ceramic shell:Rare earth oxide doping strategy 认领 引用
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作者 Baohong Kou Wentao Zhou +1 位作者 Yujie Lin Jing Ouyang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期933-945,I0007,共13页
To inhibit the interfacial(displacement)reaction between Hf and Al elements in the DZ125 superalloy and the Al2O3 and SiO2 in the Al2O3-based ceramic shell,rare-earth oxides(La2O3 and Y2O3)w... To inhibit the interfacial(displacement)reaction between Hf and Al elements in the DZ125 superalloy and the Al2O3 and SiO2 in the Al2O3-based ceramic shell,rare-earth oxides(La2O3 and Y2O3)were used as dopants into the shell.The effects of dopant types and contents(2 wt%,5 wt%and 8 wt%)on the wettability and interfacial reaction were investigated using the sessile-drop experiment,and the reaction products were analyzed by X-ray diffraction(XRD),a scanning electron microscope(SEM),an electron probe microanalyzer(EPMA)and X-ray photoelectron spectroscopy(XPS),to clarify the mechanism of dopants in the interracial reaction.The results show that increasing the Y2O3 doping content(2 wt%-8 wt%)reduces the surface porosity from 22.39%to 13.43%,and decreases the surface roughness from 3.25 to 2.28μm,which enhances the packing density of the shell surface.In the sintering process(1223 K,2 h),both La2O3 and Y2O3 dopants react with SiO2,forming La2Si2O7 and Y2SiO5 on the shell surface.During the interfacial reaction process(1823 K,40 min),La2Si2O7 decomposes and reacts with Al2O3 and HfO2,resulting in the formation of SiO2·HfO2·La2O3 and Al2O3·HfO2·La2O3 ternary composite oxides within the reaction products.At 8 wt%La2O3 dopant content,the interfacial reaction is exacerbated,resulting in the uneven wettability.Y2SiO5 further reacts with Al2O3 and SiO2 to form SiO2·Al2O3·Y2O3 ternary composite oxides,while Y2O3 combines with Al2O3 to form Al5Y3O12(VAG),which stabilizes the oxides within the shell and inhibits the interfacial reaction,and significantly improves the surface quality of the DZ125 superalloy.As the Y2O3 dopant content increases(2 wt%-8 wt%),the wetting angle increases from 97.8°to 110.6°. 展开更多
关键词 Al2O3-Based ceramic shel DZ125 superalloy Rare earths Dopant Interfacial reaction Wettability
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Effect of active metal oxide dopants on wettability and interfacial reaction between K417G superalloy and Al2O3-based ceramic shell 认领 引用
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作者 Bao-hong KOU Wen-tao ZHOU +1 位作者 Yong-hui PENG Jing OUYANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第1期244-258,共15页
Some active metal oxides(Al2O3,TiO2,and Cr2O3)were selected as dopants to the Al2O3-based ceramic shells for investment casting of K417G superalloy.The effects of dopant types and contents(0,2,5,a... Some active metal oxides(Al2O3,TiO2,and Cr2O3)were selected as dopants to the Al2O3-based ceramic shells for investment casting of K417G superalloy.The effects of dopant types and contents(0,2,5,and 8 wt.%)on the wettability and interfacial reaction between the alloy and shell were investigated by a sessile-drop experiment.The results show that increasing the Al2O3 doping contents(0−8 wt.%)reduces the porosity(21.74%−10.08%)and roughness(3.22−1.34μm)of the shell surface.The increase in Cr2O3 dopant content(2−8 wt.%)further exacerbates the interfacial reaction,leading to an increase in the thickness of the reaction layer(2.6−3.1μm)and a decrease in the wetting angle(93.9°−91.0°).The addition of Al2O3 and TiO2 dopants leads to the formation of Al2TiO5 composite oxides in the reaction products,which effectively inhibits the interfacial reaction.The increase in TiO2 dopant contents(0−8 wt.%)further promotes the formation of Al2TiO5,which decreases the thickness of the interfacial reaction layer(3.9−1.2μm)and increases the wetting angle(95.0°−103.8°).The introduced dopants enhance the packing density of the shell surface,while simultaneously suppress the diffusion of active metal elements from the alloy matrix to the interface. 展开更多
关键词 Al2O3-based ceramic shell K417G superalloy metal oxide dopants interfacial reaction wettability
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Remarkable Enhancement of the Activity and Hydrothermal Stability of a CeO2-Based NH3-SCR Catalyst by Sn Modification 认领 引用 被引量：2
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作者 Ying Zhu Jingjing Liu +5 位作者 Guangzhi He Shaohua Xie Wenpo Shan Zhihua Lian Fudong Liu Hong He 《Engineering》 SCIE EI CSCD 2025年第5期141-150,共10页
Catalytic activity and hydrothermal stability are both crucial for the application of the selective catalytic reduction of NOxwith NH3(NH3-SCR)catalyst in diesel vehicles.In this study,a tin(Sn)-modified Ce-N... Catalytic activity and hydrothermal stability are both crucial for the application of the selective catalytic reduction of NOxwith NH3(NH3-SCR)catalyst in diesel vehicles.In this study,a tin(Sn)-modified Ce-Nb mixed-oxide catalyst was synthesized as an NH3-SCR catalyst for NOxemission control.After the intro-duction of Sn,both the NH3-SCR activity and the hydrothermal stability of the catalyst were remarkably promoted.Even after hydrothermal aging at 1000℃,the developed Ce1Sn2Nb1Oxcatalyst achieved more than 90%NOxconversion at 325-500℃.Various methods,including N2-physisorption,X-ray diffraction,in-situ high-temperature X-ray diffraction,high-resolution transmission electron microscopy,X-ray pho-toelectron spectroscopy,X-ray absorption fine-structure spectroscopy,temperature-programmed reduc-tion of hydrogen,temperature-programmed desorption of ammonia,and density functional theory calculations were used to investigate the promotional effects induced by the Sn species.The characteri-zation results showed that the addition of Sn not only promoted the formation of the Ce-Nb active phase but also improved its thermal stability,contributing to the excellent NH3-SCR performance and hydrothermal stability.This study provides an excellent sintering-resistance catalyst for the application of diesel engine NOxemission control. 展开更多
关键词 SnO2 CeO2-based catalyst NH3-SCR Hydrothermal stability NOxemission control
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Effect of ZrO2-based refractory on non-metallic inclusions in nickel-based superalloy K4169 认领 引用
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作者 Li-Kun Long Lin-Zhu Wang +3 位作者 Xiang Li Chao-Yi Chen Jun-Qi Li Xing Ran 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期63-74,共12页
The effects of ZrO2-based refractory materials on non-metallic inclusions in nickel-based superalloy K4169 were systematically investigated.Analytical methods,including X-ray fluorescence,X-ray diffraction,scanning... The effects of ZrO2-based refractory materials on non-metallic inclusions in nickel-based superalloy K4169 were systematically investigated.Analytical methods,including X-ray fluorescence,X-ray diffraction,scanning electron microscopy equipped with energy dispersive spectrometry,and FactSage simulations,revealed that the refractory primarily consisted of ZrO2,MgO,MgO·Al2O3,and Zr1.74Y0.26O3.87 phases.During melting,MgO reacted with[Al]and[O]in the alloy,forming MgO·Al2O3 at the interface.This phase adhered to the superalloy,while ZrO2 phases remained stable.The inclusions in the alloy transformed from Al2O3 to MgO·Al2O3,with variations in size and distribution influenced by location and pressure.FactSage kinetic simulations aligned with experimental findings,elucidating the interaction mechanisms between the alloy and refractory.These results provide insights into optimizing refractory materials for improved cleanliness and performance in nickel-based superalloy production. 展开更多
关键词 ZrO2-based refractory Nickel-based superalloy Non-metallic inclusion Kinetic calculation
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Effect of Ce element on hydrogen storage property of TiMn2-based alloys 认领 引用
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作者 Wenjiao Zhou Tongyue Li +3 位作者 Anjia Zhang Yaheng Zhao Qichen Tang Xiping Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第3期971-979,共9页
This study investigates the effect of Ce content on the hydrogen storage properties of Ti0.98Zr0.02Mn1.5Cr0.05V0.43Fe0.09Cex(x=0,0.02,0.04,and 0.06,at%)alloys.Microstructural analysis of these all... This study investigates the effect of Ce content on the hydrogen storage properties of Ti0.98Zr0.02Mn1.5Cr0.05V0.43Fe0.09Cex(x=0,0.02,0.04,and 0.06,at%)alloys.Microstructural analysis of these alloys revealed dendritic microstructures without the segregation of chemical elements,with the C14 Laves phase identified as the dominant phase.After two activation cycles at 4 MPa and 293 K,the alloys exhibited excellent hydrogen absorption properties.The addition of Ce significantly improved the kinetics of the alloys.At x=0.02,the hydrogen absorption capacity reached 90%of its maximum within 137 s at 293 K.Pressure-composition-temperature curves indicated that hydrogen absorption capacity initially increased first and then decreased with increasing Ce content,reaching a maximum value of 1.85wt%at x=0.04.Thermodynamic results demonstrated that the enthalpy and entropy of hydrogen absorption followed a similar trend,which was consistent with the variation in hydrogen storage capacity.Thus,the improvement in hydrogen absorption capacity due to the addition of Ce is attributed to the increase in enthalpy.The increase of the lattice constant in the C14 Laves phase and the deoxidization effect of Ce are expected to be beneficial for the improvement of hydrogen absorption kinetics. 展开更多
关键词 hydrogen storage property TiMn2-based alloys Ce element pressure-composition-temperature curve
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Grain boundary engineering of CeO2 induced electron redistribution for dimethyl carbonate synthesis from CO2 认领 引用
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作者 Guoqiang Hou Di Xu +3 位作者 Haifeng Fan Yangyang Li Siyi Huang Mingyue Ding 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第1期316-329,共14页
Direct synthesis of dimethyl carbonate(DMC)from CO2 is critical for achieving carbon neutrality,yet the sluggish formation and conversion of the key*CH₃OCOO intermediate-due to the difficulty of C-O coupling-limit ... Direct synthesis of dimethyl carbonate(DMC)from CO2 is critical for achieving carbon neutrality,yet the sluggish formation and conversion of the key*CH₃OCOO intermediate-due to the difficulty of C-O coupling-limit high DMC yields.Herein,we developed a boric acid-assisted recrystallization strategy to fabricate grain-boundary-rich CeO2 hollow nanospheres,which serve as an efficient catalyst for CO2 to DMC synthesis.The introduction of grain-boundary(GBs)induced the electron redistribution,which led a decrease in the electron density of bulk Ce ions and created a localized electron-rich region at homogeneous interface.This unique electronic landscape promoted reactive methoxy formation and stronger CO2 adsorption,thereby enabling more efficient coupling of*CH3O and*CO2 to form the*CH3OCOO.Concurrently,the enhanced CO2 adsorption facilitated the dissociation of*CH3OCOO and subsequent DMC formation.As a result,the 4%BCeO2-GBs achieved an advantageous DMC yield of 19.8 mmol/g.In the assistance of dehydrating agent,the catalyst delivered a remarkable 264.2 mmol/g DMC yield and 7.12%methanol conversion,which was 32 times higher than commercial CeO2.This study elucidated the intrinsic mechanisms governing*CH3OCOO intermediate behavior and offers valuable guidance for CO2 converting into high-value organic chemicals. 展开更多
关键词 Dimethyl carbonate synthesis CeO2 catalyst Grain boundary engineering Electron redistribution Reaction intermediates
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A review of Al2O3-based eutectic ceramics for high-temperature structural materials 认领 引用 被引量：1
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作者 Xu Wang Yujie Zhong Qiaodan Hu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第11期214-232,共19页
Al2O3-based eutectic ceramics are considered as promising candidates for ultra-high-temperature structural materials due to their exceptional thermal stability and mechanical properties.Nonetheless,several chall... Al2O3-based eutectic ceramics are considered as promising candidates for ultra-high-temperature structural materials due to their exceptional thermal stability and mechanical properties.Nonetheless,several challenges must be overcome before they can be widely used.This paper reviews in detail the tailoring of microstructure from the aspect of process parameters,the updated knowledge gained in microstructure(crystallographic orientation,high-resolution interfacial structures)and the latest means of optimizing eutectic microstructure(seed-induced method,introducing low-energy grain boundaries and high-entropy phase).Additionally,the paper explores future techniques for the fabrication of bulk ceramic materials and effective toughening approaches.This review highlights the achievements made especially in the last 15 years,current limitations in Al2O3-based eutectic ceramics,and offers comprehensive insights and strategic guidance for further mechanical breakthroughs. 展开更多
关键词 Al2O3-based eutectic ceramics Eutectic solidification Interfacial structures Mechanical properties High-entropy oxides
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Origin of high strength and good ductility of TiH2-based powder metallurgy titanium alloy with discontinuous lamellar structures 认领 引用
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作者 Hai-rui ZHANG Hong-zhi NIU +3 位作者 Chao YANG Nan XIANG De-liang ZHANG Fu-xiao CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第10期3342-3356,共15页
A unique discontinuous lamellar microstructure of titanium alloys consisting of lamellar colonies at prior β-Ti grain boundaries and internal interwoven α-laths is prepared by a TiH2-based powder metallurgy metho... A unique discontinuous lamellar microstructure of titanium alloys consisting of lamellar colonies at prior β-Ti grain boundaries and internal interwoven α-laths is prepared by a TiH2-based powder metallurgy method.The α-variants get various crystallographic orientations and become discontinuous during vacuum annealing at 700℃.Remarkably,nanoscale phase δ-TiH compound layers are generated between α-laths and β-strips,so that dislocations are piled up at the α/δ/βinterfaces during tensile deformation.This leads to dislocation slips being confined to individual α-laths,with differentslips and particularly pyramidalslips being activated.The efficiency of wavy slip is promoted and the work hardening rate is enhanced.Finally,the combined effect of dispersed micro-shear bands and lath distortions is considered contributive for alleviating the stress concentration at grain boundaries,resulting in a high-promising synergy of enhanced ultimate tensile strength of 1080 MPa and good elongation to fracture of 13.6%. 展开更多
关键词 TiH2-based powder metallurgy discontinuous lamellar microstructure interfacialδ-TiH phase tensile properties deformation behavior
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Effect of mesoporous FA-SiO2 extracted from fly ash on the structural and photocatalytic properties of g-C3N4-based materials 认领 引用
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作者 Xianhua LI Qingbo YU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2025年第7期694-706,共13页
To explore high value-added utilization pathways of fly ash,the mesoporous structure of silicon dioxide extracted from fly ash(FA-SiO2)was utilized to restrict the dicyandiamide(DCDA)thermal degradation process.Thi... To explore high value-added utilization pathways of fly ash,the mesoporous structure of silicon dioxide extracted from fly ash(FA-SiO2)was utilized to restrict the dicyandiamide(DCDA)thermal degradation process.This produced chemically bonded interacting composite photocatalysts of FA-SiO,and graphitic-phase carbon nitride(g-C3N4).Compared with the spherical silicon dioxide prepared using tetraethyl orthosilicate(TEOS-SiO2),the mesoporous structure of FA-SiO2,allowed DCDA to react in a smaller space,which facilitated the transformation of DCDA to melamine by the thermal degradation kinetics of FA-C3N4/DCDA.This ultimately boosted the formation of an N-atom-removed triazine ring structure and a multistage structure combining lumps and rods in the composite photocatalysts of g-C3N4,and FA-SiO2,which led to a higher visible-light utilization efficiency,a suitable valence-band position,and the photocatalytic activity for methylene blue reaching 3.56 times that of g-C3N4.The findings indicate that mesoporous FA-SiO,has the potential to improve the structural and photocatalytic properties of g-C3N4,-based materials. 展开更多
关键词 Fly ash(FA) FA-SiO2 g-C3N4-based materials Structural and photocatalytic properties
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Developing sodium-doped ceria-based electrolytes for low-temperature solid oxide fuel cells 认领 引用
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作者 Qi An Ruyi Hou +5 位作者 Xinchao Mei Muhammad Afzal Wenjing Dong Baoyuan Wang Xunying Wang Chen Xia 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期2055-2068,I0046-I0052,共14页
Na-doped CeO2(NDC)electrolytes with 0.05,0.10,0.15,and 0.20 molar ratios of Na ions(0.05NDC,0.1NDC,0.15NDC,and 0.2NDC)were synthesized and systematically evaluated for low-temperature solid oxide fuel cell(SOFC)app... Na-doped CeO2(NDC)electrolytes with 0.05,0.10,0.15,and 0.20 molar ratios of Na ions(0.05NDC,0.1NDC,0.15NDC,and 0.2NDC)were synthesized and systematically evaluated for low-temperature solid oxide fuel cell(SOFC)applications.Density function-al theory(DFT)calculations reveal that Na doping lowers the oxygen-vacancy formation energy.Structural analysis confirms progressive lattice expansion in NDCs and a maximum oxygen-vacancy concentration in 0.15NDC,while incomplete incorporation of Na in 0.2NDC yields residual Na2CO3.Conductivity studies demonstrate negligible electronic conductivity and a peak ionic conductivity in 0.15NDC,suggesting that moderate Na doping enhances ionic transport,whereas excessive dopant is detrimental.Two 0.15NDC-based SOFCs are fabricated by ceramic and dry-pressing methods,and their maximum power densities at 550°C are 208 and 778 mW·cm−2,respectively,indicating the rapid ionic transport of the 0.15NDC electrolyte.These results demonstrate that Na doping is an effective route for develop-ing advanced low-temperature SOFC electrolytes. 展开更多
关键词 solid oxide fuel cells Na-doped CeO2 electrolyte oxygen vacancy ionic conductivity high performance
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Effects of CeO_2 on microstructure and corrosion resistance of TiC-VC reinforced Fe-based laser cladding layers 认领 引用 被引量：32
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作者 张辉 邹勇 +1 位作者 邹增大 史传伟 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第11期1095-1100,共6页
The effects of CeO2 on microstructure and corrosion resistance of TiC-VC reinforced Fe-based laser cladding layers were investigated. The results showed that carbides presented in cladding layers were TiVC2 and VC. A ... The effects of CeO2 on microstructure and corrosion resistance of TiC-VC reinforced Fe-based laser cladding layers were investigated. The results showed that carbides presented in cladding layers were TiVC2 and VC. A small quantity of CeC appeared with 2.0 wt.% CeO2 addition. The amount of lamellar pearlite increased while the amount of residual austenite decreased with increasing CeO2 addition. The corrosion resistance of cladding layers increased firstly and then decreased with the addition of CeO2 increasing. The EIS spectrum of the cladding layer without CeO2 was composed of an inductive arc at low frequency and a capacitive arc at high frequency. The cladding layer with 0.5 wt.% CeO2 addition showed the best corrosion resistance, and then the inductive arc at low frequency transformed into a capacitive arc. 展开更多
关键词 laser cladding rare earths CeO2 corrosion resistance electrochemical impedance spectroscopy
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Enhanced synaptic properties in HfO2-based trilayer memristor by using ZrO2-x oxygen vacancy reservoir layer for neuromorphic computing 认领 引用 被引量：1
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作者 Turgun Boynazarov Joonbong Lee +5 位作者 Hojin Lee Sangwoo Lee Hyunbin Chung Dae Haa Ryu Haider Abbas Taekjib Choi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第24期164-173,共10页
Neuromorphic computing devices leveraging HfO2 and ZrO2 materials have recently garnered significant attention due to their potential for brain-inspired computing systems.In this study,we present a novel trilaye... Neuromorphic computing devices leveraging HfO2 and ZrO2 materials have recently garnered significant attention due to their potential for brain-inspired computing systems.In this study,we present a novel trilayer Pt/HfO2/ZrO2-x/HfO2/TiN memristor,engineered with a ZrO2-x oxygen vacancy reservoir(OVR)layer fabricated via radio frequency(RF)sputtering under controlled oxygen ambient.The incorporation of the ZrO2-x OVR layer enables enhanced resistive switching characteristics,including a high ON/OFF ratio(∼8000),excellent uniformity,robust data retention(>105 s),and multilevel storage capabilities.Furthermore,the memristor demonstrates superior synaptic plasticity with linear long-term potentiation(LTP)and depression(LTD),achieving low non-linearity values of 1.36(LTP)and 0.66(LTD),and a recognition accuracy of 95.3%in an MNIST dataset simulation.The unique properties of the ZrO2-x layer,particularly its ability to act as a dynamic oxygen vacancy reservoir,significantly enhance synaptic performance by stabilizing oxygen vacancy migration.These findings establish the OVR-trilayer memristor as a promising candidate for future neuromorphic computing and high-performance memory applications. 展开更多
关键词 HfO2-based trilayer memristor ZrO2-xoxygen vacancy reservoir Synaptic plasticity Non-volatile memory Neuromorphic computing
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Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst 认领 引用 被引量：8
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作者 李凯 王学中 +2 位作者 周泽兴 吴晓东 翁端 《Journal of Rare Earths》 SCIE EI CAS 2007年第1期6-10,共5页
CZO （CeO2-ZrO2） and CZYO （CeO2-ZrO2-Y2O3） series of mixed oxides were prepared by coprecipitaion, and a part of these oxides were loaded with precious metals （PM）. XRD, BET, and oxygen storage capacity （OSC） i... CZO （CeO2-ZrO2） and CZYO （CeO2-ZrO2-Y2O3） series of mixed oxides were prepared by coprecipitaion, and a part of these oxides were loaded with precious metals （PM）. XRD, BET, and oxygen storage capacity （OSC） investigations were performed on samples aged at 750, 900, and 1050 ℃. It was observed that BET surface area and OSC showed a marked decrease in CeO2 aged at high temperature, and the erystallite size showed an obvious increase. The CZO samples consist of cubic- and tetragonal crvstal phases, and their crystallite size increase rapidly when aged at high temperature. The CZYO samples consist of single crystal phase when the content of Y exceeds 0.15 mol, and their erystallite size increases slowly during high-temperature aging. It is concluded that additive Y can stabilize the performance of CZYO oxides. In the aged CZO and CZYO mixed-oxide systems, addition of a small amount of precious metals （Pt, Pd, Rh） increased the rate of reduction and led to an obvious improvement in OSC. OSC of CZO and CZYO with precious metals are related to their composition and the type of precious metal. 展开更多
关键词 CeO2 CZO CZYO rare earths oxygen storage capacity precious metal
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Screening of MgO- and CeO_2-Based Catalysts for Carbon Dioxide Oxidative Coupling of Methane to C2+ Hydrocarbons 认领 引用 被引量：5
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作者 Istadi Nor Aishah Saidina Amin 《Journal of Natural Gas Chemistry》 2004年第1期23-35,共13页
The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based so... The catalyst screening tests for carbon dioxide oxidative coupling of methane (CO2-OCM) have been investigated over ternary and binary metal oxide catalysts. The catalysts are prepared by doping MgO- and CeO2-based solids with oxides from alkali (Li2O), alkaline earth (CaO), and transition metal groups (WO3 or MnO). The presence of the peroxide (O2-2) active sites on the Li2O2, revealed by Raman spectroscopy, may be the key factor in the enhanced performance of some of the Li2O/MgO catalysts. The high reducibility of the CeO2 catalyst, an important factor in the CO2-OCM catalyst activity, may be enhanced by the presence of manganese oxide species. The manganese oxide species increases oxygen mobility and oxygen vacancies in the CeO2 catalyst. Raman and Fourier Transform Infra Red (FT-IR) spectroscopies revealed the presence of lattice vibrations of metal-oxygen bondings and active sites in which the peaks corresponding to the bulk crystalline structures of Li2O, CaO, WO3 and MnO are detected. The performance of 5%MnO/15%CaO/CeO2 catalyst is the most potential among the CeO2-based catalysts, although lower than the 2%Li2O/MgO catalyst. The 2%Li2O/MgO catalyst showed the most promising C2+ hydrocarbons selectivity and yield at 98.0% and 5.7%, respectively. 展开更多
关键词 catalyst screening carbon dioxide oxidative coupling methane ternary metal oxide binary metal oxide MgO CeO2 C2+ hydrocarbons
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Research Progress and Prospects of ZrO2-Based Catalysts in CO2 Hydrogenation 认领 引用
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作者 Hao Deng Fanjun Luo +2 位作者 Gang Feng Rongbin Zhang Runping Ye 《Carbon and Hydrogen》 SCIE CAS CSCD 2025年第4期401-419,共19页
The escalating atmospheric CO2 levels necessitate efficient catalytic technologies for its conversion into value-added chemicals.This review systematically summarizes recent advances in ZrO2-based catalysts for ... The escalating atmospheric CO2 levels necessitate efficient catalytic technologies for its conversion into value-added chemicals.This review systematically summarizes recent advances in ZrO2-based catalysts for CO2 hydrogenation,emphasizing their multifunctional roles beyond conventional supports.Owing to its tunable crystalline phases,abundant oxygen vacancies,and synergistic metal-support interactions,ZrO2 significantly enhances catalytic performance in producing methane,methanol,and other products.Key design strategies,such as phase engineering,morphology control,and the construction of inverse or composite structures,are discussed in relation to their influence on CO2 adsorption,intermediate stabilization,and reaction pathway regulation.Mechanistic insights reveal that ZrO2 facilitates H2 dissociation,promotes hydrogen spillover,and stabilizes active metal species,thereby optimizing product selectivity and catalyst durability.Furthermore,tandem catalytic systems integrating ZrO2 with zeolites demonstrate exceptional potential in steering C-C coupling while suppressing over-hydrogenation.This review not only elucidates structure-activity relationships and kinetic behaviors but also outlines future research directions,including in situ characterization and scalable catalyst design,thereby providing critical guidance for the development of high-performance CO2 hydrogenation catalysts and advancing carbon-neutral fuel and chemical production. 展开更多
关键词 CO2hydrogenation metal-support interactions oxygen vacancies reaction mechanism ZrO2-based catalysts
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Quantitative characterization of reaction behavior between La-bearing FeCrAl melt and CaO–Al2O3–La2O3-based slags and its guidance for design of mold flux 认领 引用
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作者 Lei Fan Tian-peng Qu +1 位作者 De-yong Wang Cheng-jun Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第3期646-658,共13页
The reaction behavior between CaO–Al2O3–La2O3-based slags and La-bearing FeCrAl melt was quantitatively characterized,which was further compared with the reaction behavior of CaO–SiO2-based slags.Bas... The reaction behavior between CaO–Al2O3–La2O3-based slags and La-bearing FeCrAl melt was quantitatively characterized,which was further compared with the reaction behavior of CaO–SiO2-based slags.Based on this,the new type of mold flux for La-bearing FeCrAl alloy continuous casting was designed and its basic properties were evaluated.The results showed that the order of reaction degree of fluxing agents in CaO–Al2O3–La2O3-based slags is(Na2O)>(B2O3)>(Li2O),and the percentages of mass change of fluxing agents were 85.8,54.29 and 42.35 wt.%,respectively.Moreover,the addition of(Li2O)and(Na2O)promoted the reaction between(CaO)and[Al],and the reaction degree of the former was weaker than that of the latter,which was due to the greater effect of(Na2O)on the activity of(CaO)and(Al2O3)than(Li2O).Compared with the reactivity of CaO–SiO2-based slags,the percentages of mass change of Al and La caused by slag–steel reaction decreased by 10.63–14.36 and 39.78–50.49 wt.%,respectively.The percentages of mass change of(Al2O3),(La2O3)and(CaO)in slags highest increased by 17.71,17.98,and 7.81 wt.%,respectively.The reactivity of CaO–Al2O3–La2O3-based slags was significantly weakened.Ultimately,the new type of mold flux was designed and the composition range was determined.The fundamental properties of new mold flux basically meet the theoretical requirements for La-bearing FeCrAl alloy continuous casting. 展开更多
关键词 La-bearing FeCrAl melt CaO-Al2O3-La2O3-based slag Reaction behavior Quantitative characterization Mold flux design
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Temperature-Programmed Reduction and Dispersive X-Ray Absorption Spectroscopy Studies of CeO2-Based Nanopowders for Intermediate-Temperature Solid-Oxide Fuel Cell Anodes 认领 引用
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作者 Marina S. Bellora Joaquí +6 位作者 n Sacanell Cristiá n Huck-Iriart Analí a L. Soldati Susana A. Larrondo Diego G. Lamas 《Materials Sciences and Applications》 2019年第10期631-642,共12页
In this work, we study the influence of the average crystallite size and dopant oxide on the reducibility of CeO2-based nanomaterials. Samples were prepared from commercial Gd2O3-, Sm2O3- and Y2O3-doped CeO2 powders b... In this work, we study the influence of the average crystallite size and dopant oxide on the reducibility of CeO2-based nanomaterials. Samples were prepared from commercial Gd2O3-, Sm2O3- and Y2O3-doped CeO2 powders by calcination at different temperatures ranging between 400°C and 900°C and characterized by X-ray powder diffraction, transmission electron microscopy and BET specific surface area. The reducibility of the samples was analyzed by temperature-programmed reduction and in situ dispersive X-ray absorption spectroscopy techniques. Our results clearly demonstrate that samples treated at lower temperatures, of smallest average crystallite size and highest specific surface areas, exhibit the best performance, while Gd2O3-doped ceria materials display higher reducibility than Sm2O3- and Y2O3-doped CeO2. 展开更多
关键词 Crystallite Size CeO2-Based Nanomaterials Sm2O3
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Synthesis and Catalytic Performance of a New V-doped CeO2-supported Alkali-activated-steel-slag-based Photocatalyst 认领 引用 被引量：5
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作者 KANG Le DU Huiling +3 位作者 DENG Jun JING Xinrui ZHANG Sen ZNANG Yaojun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第2期209-214,共6页
A novel V-doped CeO2-supported alkali-activated-steel-slag-based catalyst(V-CeO2/AC)for photocatalytic decomposition of water to hydrogen was prepared via co-impregnation method.The chemical composition,mineral ... A novel V-doped CeO2-supported alkali-activated-steel-slag-based catalyst(V-CeO2/AC)for photocatalytic decomposition of water to hydrogen was prepared via co-impregnation method.The chemical composition,mineral phase,morphology,and optical performances of the synthesized catalyst samples were characterized by XRF,XRD,SEM,UV-Vis DRS,and so on.XRD and SEM results show that calcium silicate hydrate(Ca1.5SiO3.5·xH2O)mineral phase is formed in the carrier sample,and the prepared catalyst specimens are made up of approximately 50 nm particles.After 6 hours of xenon lamp irradiation,the catalyst supported on V-doped 8wt%CeO2 exhibits the highest photocatalytic hydrogen production activity(8292μmol/g),which is attributed to the interaction between the V-doped CeO2 active components and FeO existed in catalyst carrier.A possible photocatalytic decomposition of water for hydrogen production mechanism over the V-8CeO2/AC catalyst was proposed. 展开更多
关键词 V-doped CeO2 alkali-activated-steel-slag-based catalyst photocatalysis water splitting hydrogen production
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Effect of Ni-coated MoS2 on microstructure and tribological properties of(Cu−10Sn)-based composites 认领 引用 被引量：14
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作者 Tian-xu QIU Shi-yan PAN +2 位作者 Cang FAN Xu-fei ZHU Xiao-ping SHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第9期2480-2490,共11页
The(Cu−10Sn)−Ni−MoS2 composites,prepared by powder metallurgy,were studied for the effects of Ni-coated MoS2 on the microstructure,mechanical properties and lubricating properties.The mechanism of effects of Ni and Mo... The(Cu−10Sn)−Ni−MoS2 composites,prepared by powder metallurgy,were studied for the effects of Ni-coated MoS2 on the microstructure,mechanical properties and lubricating properties.The mechanism of effects of Ni and MoS2 on the properties of composites was analyzed through a comparative experiment by adding Ni and MoS2 separately.The results show that the nickel wrapping around the MoS2 particles decreases the reaction rate of MoS2 with the copper matrix,and greatly improves the bonding of the matrix.The composites with 12 wt.%Ni-coated MoS2(C12)show the optimum performance including the mechanical properties and tribological behaviors.Under oil lubrication conditions,the friction coefficient is 0.0075 with a pressure of 8 MPa and a linear velocity of 0.25 m/s.The average dry friction coefficient,sliding against 40Cr steel disc,is measured to be 0.1769 when the linear velocity and pressure are 0.25 m/s and 4 MPa,respectively. 展开更多
关键词 tribology solid-lubricating interface bonding Ni-coated MoS2 (Cu−10Sn)-based composites
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