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Optimized Copper Distribution and Enhanced Coercivity in PrO2-Doped Sm2Co17-Type Magnets 认领 引用
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作者 Qi-Qi Yang Jun Li +3 位作者 Yu-Cheng Hu Xiao-Yu Zhu Tao Yuan Ying Liu 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期237-250,共14页
A rational design of Cu distribution is crucial for achieving optimal magnetic properties in Sm2Co17-type magnets.In this study,nanostructured PrO2 powders were employed to induce Cu redistribution at grain b... A rational design of Cu distribution is crucial for achieving optimal magnetic properties in Sm2Co17-type magnets.In this study,nanostructured PrO2 powders were employed to induce Cu redistribution at grain boundaries while preserving the cellular microstructure.The corresponding coercivity(Hcj),remanence(Br),and maximum energy product((BH)max) were significantly enhanced in the 1 wt% PrO2-doped magnet,with improvements of 4.36 kOe,0.22 kGs and 1.1 MGOe,respectively.These results surpass those of most rare-earth-oxide-doped Sm2Co17-type magnets reported to date.Microstructure characterization and micromagnetic simulations confirm that the coarse Cu-rich phase induced by PrO2 doping enhances the pinning strength at grain boundaries,thereby contributing to the observed coercivity enhancement.The(Sm1-xPrx)2Co17 phase exhibits a higher substitution energy barrier at Co sites,which promotes Cu migration toward grain boundaries.Meanwhile,the(Sm1-xPrx)2Co17phase also slightly improves the remanence in the 1 wt% PrO2-doped magnet due to its higher saturation magnetization(Ms).However,excessive PrO2 doping(2 wt%),while further increasing coercivity by 6.45 kOe,adversely affects squareness and remanence.This study demonstrates a viable strategy for fabricating high-performance Sm2Co17-type permanent magnets while enabling efficient utilization of rare-earth Pr oxides. 展开更多
关键词 cellular structure Cu migration PrO2-doping Sm2Co17-type magnets
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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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Fabrication of Gd2O3-doped CeO2thin films through DC reactive sputtering and their application in solid oxide fuel cells 认领 引用 被引量：5
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作者 Fuyuan Liang Jiaran Yang +1 位作者 Haiqing Wang Junwei Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第6期1190-1197,共8页
Physical vapor deposition(PVD)can be used to produce high-quality Gd2O3-doped CeO2(GDC)films.Among various PVD methods,reactive sputtering provides unique benefits,such as high deposition rates and easy upscalin... Physical vapor deposition(PVD)can be used to produce high-quality Gd2O3-doped CeO2(GDC)films.Among various PVD methods,reactive sputtering provides unique benefits,such as high deposition rates and easy upscaling for industrial applications.GDC thin films were successfully fabricated through reactive sputtering using a Gd0.2Ce0.8(at%)metallic target,and their application in solid oxide fuel cells,such as buffer layers between yttria-stabilized zirconia(YSZ)/La0.6Sr0.4Co0.2Fe0.8O3−δand as sublayers in the steel/coating system,was evaluated.First,the direct current(DC)reactive-sputtering behavior of the GdCe metallic target was determined.Then,the GDC films were deposited on NiO-YSZ/YSZ half-cells to investigate the influence of oxygen flow rate on the quality of annealed GDC films.The results demonstrated that reactive sputtering can be used to prepare thin and dense GDC buffer layers without high-temperature sintering.Furthermore,the cells with a sputtered GDC buffer layer showed better electrochemical performance than those with a screen-printed GDC buffer layer.In addition,the insertion of a GDC sublayer between the SUS441 interconnects and the Mn-Co spinel coatings contributed to the reduction of the oxidation rate for SUS441 at operating temperatures,according to the area-specific resistance tests. 展开更多
关键词 solid oxide fuel cell physical vapor deposition Gd2O3-doped CeO2 metallic interconnects electrical conductivity
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Supercritical water syntheses of transition metal-doped CeO_2 nano-catalysts for selective catalytic reduction of NO by CO:An in situ diffuse reflectance Fourier transform infrared spectroscopy study 认领 引用 被引量：17
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作者 Xiaoxia Dai Weiyu Jiang +4 位作者 Wanglong Wang Xiaole Weng Yuan Shang Yehui Xue Zhongbiao Wu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第4期728-735,共8页
In the present study,we synthesized CeO2 catalysts doped with various transition metals(M=Co,Fe,or Cu)using a supercritical water hydrothermal route,which led to the incorporation of the metal ions in the CeO2 lattice... In the present study,we synthesized CeO2 catalysts doped with various transition metals(M=Co,Fe,or Cu)using a supercritical water hydrothermal route,which led to the incorporation of the metal ions in the CeO2 lattice,forming solid solutions.The catalysts were then used for the selective catalytic reduction(SCR)of NO by CO.The Cu‐doped catalyst exhibited the highest SCR activity;it had a T50(i.e.,50%NO conversion)of only 83°C and a T90(i.e.,90%NO conversion)of 126°C.Such an activity was also higher than in many state‐of‐the‐art catalysts.In situ diffuse reflectance Fourier transform infrared spectroscopy suggested that the MOx‐CeO2 catalysts(M=Co and Fe)mainly followed an Eley‐Rideal reaction mechanism for CO‐SCR.In contrast,a Langmuir‐Hinshelwood SCR reaction mechanism occurred in CuO‐CeO2 owing to the presence of Cu+species,which ensured effective adsorption of CO.This explains why CuO‐CeO2 exhibited the highest activity with regard to the SCR of NO by CO. 展开更多
关键词 Supercritical water Nitrogen oxides CO Selective catalytic reduction Diffuse reflectance Fourier transform infrared spectroscopy CeO2
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Preparation and characterization of Cu-doped mesoporous CeO_2 for CO oxidation 认领 引用 被引量：2
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作者 田俊杰 纳薇 +1 位作者 王华 高文桂 《Journal of Central South University》 SCIE EI CAS 2014年第2期482-486,共5页
Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterize... Mesoporous CeO2 was first synthesized by hydrothermal method,and then used to synthesize different contents of CuO)x/CeO2(x:molar ratio of Cu to Ce) by deposition-precipitation method.These materials were characterized by X-ray diffraction(XRD),N2 adsorption and desorption,H2 temperature programmed reduction(H2-TPR) and O2 temperature programmed desorption(O2-TPD) to study the crystal structure,surface area,and the mechanism of CO oxidation.The results show that,on XRD patterns,no evidence of CuO diffraction peaks is present until Cu loading is increased to 20%.The BET surface area decreases noticeably with the increase of Cu content.Compared with other samples,the better reducibility and activity oxygen species of(CuO)10%/CeO2coincide with its better catalytic activity. 展开更多
关键词 mesoporous CeO2 catalytic activity CuO/CeO2 CO oxidation
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Engineering of sulfate ions migration in Fe2O3-doped NiSO4/Al2O3 catalysts to enhance the selective trimerization of propylene 认领 引用
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作者 Xu Liu Yu Ling +1 位作者 Xiao Chen Changhai Liang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第5期376-391,共16页
Propylene,a readily accessible and economically viable light olefin,has garnered substantial interest for its potential conversion into valuable higher olefins through oligomerization processes.The distribution of pro... Propylene,a readily accessible and economically viable light olefin,has garnered substantial interest for its potential conversion into valuable higher olefins through oligomerization processes.The distribution of products is profoundly influenced by the catalyst structure.In this study,Fe2O3-doped NiSO4/Al2O3 catalysts have been meticulously developed to facilitate the selective trimerization of propylene under mild conditions.Significantly,the 0.25Fe2O3-NiSO4/Al2O3 catalyst demonstrates an enhanced reaction rate(48.5 mmolC3/(gcat.·h)),alongside a high yield of C9(~32.2%),significantly surpassing the performance of the NiSO4/Al2O3 catalyst(C9:~24.1%).The incorporation of Fe2O3 modifies the migration process of sulfate ions,altering the Lewis acidity of the electron-deficient Ni and Fe sites on the catalyst and resulting a shift in product distribution from a Schulz-Flory distribution to a Poisson distribution.This shift is primarily ascribed to the heightened energy barrier for theβ-H elimination reaction in the C6 alkyl intermediates on the doped catalyst,further promoting polymerization to yield a greater quantity of Type II C9.Furthermore,the validation of the Cossee-Arlman mechanism within the reaction pathway has been confirmed.It is noteworthy that the 0.25Fe2O3-NiSO4/Al2O3 catalyst exhibits remarkable stability exceeding 80 h in the selective trimerization of propylene.These research findings significantly enhance our understanding of the mechanisms underlying olefin oligomerization reactions and provide invaluable insights for the development of more effective catalysts. 展开更多
关键词 Propylene trimerization Fe2O3-doped NiSO4/Al2O3catalyst Sulfate ions migration Poisson distribution Cossee-Arlman mechanism
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Morphology and crystal-plane effects of Zr-doped CeO2 nanocrystals on the epoxidation of styrene with tert-butylhydroperoxide as the oxidant 认领 引用 被引量：3
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作者 Jia Ren Xin Liu +1 位作者 Ruihua Gao Wei-Lin Dai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2017年第4期681-687,共7页
The morphology effect of Zr-doped CeOwas studied in terms of their activities in the selective oxidation of styrene to styrene oxide using tert-butyl hydroperoxide as the oxidant. In the present work, Zrdoped CeOnanor... The morphology effect of Zr-doped CeOwas studied in terms of their activities in the selective oxidation of styrene to styrene oxide using tert-butyl hydroperoxide as the oxidant. In the present work, Zrdoped CeOnanorods exhibited the highest catalytic performance（yield of styrene oxide and TOF value）followed by nanoparticles and nanocubes. For the Zr-doped CeOnanorods, the apparent activation energy is 56.3 k J/mol, which is much lower than the values of catalysts supported on nanoparticles and nanocubes（73.3 and 93.4 k J/mol）. The high resolution transmission electron microscopy results indicated that（100） and（110） crystal planes are predominantly exposed for Zr-doped CeOnanorods while（100）and（111） for nanocubes,（111） for nanoparticles. The remarkably increased catalytic activity of the Zrdoped CeOnanorods is mainly attributed to the higher percentage of Cespecies and more oxygen vacancies, which are associated with their exposed（100） and（110） crystal planes. Furthermore, recycling studies proved that the heterogeneous Zr-doped CeOnanorods did not lose its initial high catalytic activity after five successive recycles. 展开更多
关键词 Morphology effect Zr-doped CeO2 Styrene Selective oxidation Oxygen vacancies
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Ln3+(Ln=Eu,Dy)-doped Sr2CeO4 fine phosphor particles:Wet chemical preparation,energy transfer and tunable luminescence 认领 引用 被引量：7
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作者 Na Gao Yanfei Yang +4 位作者 Shikao Shi Jiye Wang Shuping Wang Jibiao Li Lianshe Fu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第12期1273-1280,共8页
The Sr2 CeO4:Ln3+(Ln=Eu,Dy)fine phosphor particles were prepared by a facile wet chemical approach,in which the consecutive hydrothermal-combustion reaction was performed.The doping of Ln3+into Sr2 CeO4 has little inf... The Sr2 CeO4:Ln3+(Ln=Eu,Dy)fine phosphor particles were prepared by a facile wet chemical approach,in which the consecutive hydrothermal-combustion reaction was performed.The doping of Ln3+into Sr2 CeO4 has little influence on the structure of host,and the as-prepared samples display wellcrystallized spherical or elliptical shape with an average particle size at about 100-200 nm.For Eu3+ions-doped Sr2 CeO4,with the increase of Eu3+-doping concentration,the blue light emission band with the maximum at 468 nm originating from a Ce4+→O2-charge transfer of the host decreases obviously and the characteristic red light emission of Eu3+(5 D0→7 F2 transition at 618 nm)is enhanced gradually.Simultaneously,the fluorescent lifetime of the broadband emission of Sr2 CeO4 decreases with the doping of Eu3+,indicating an efficient energy transfer from the host to the doping Eu3+ions.The ene rgy transfer efficiency from the host to Eu3+was investigated in detail,and the emitting color of Sr2 CeO4:Eu3+can be easily tuned from blue to red by varying the doping concentration of Eu3+ions.Moreover,the luminescence of Dy3+-doped Sr2 CeO4 was also studied.Similar energy transfer pheno menon can be observed,and the incorporation of Dy3+into Sr2 CeO4 host leads to the characteristic emission of 4 F9/2→6 H15/2(488 nm,blue light)and 4 F9/2→6 H13/2(574 nm,yellow light)of Dy3+.The Sr2 CeO4:Ln3+fine particles with tunable luminescence are quite beneficial for its potential applications in the optoelectronic fields. 展开更多
关键词 Wet chemistry preparation Sr2CeO4 Ln3+ion Phosphor Luminescence Energy transfer
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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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Enhancement of energy storage stability of LiNi0.8Co0.1Mn0.1O2cathode material in Li-ion batteries by associated LiYbO2phase generated from trace Yb3+doping:From experiment to theoretical analysis 认领 引用
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作者 Hui Yun Guangming Wang +7 位作者 Yilong Li Guannan Zu Ning Qi Yonghong Fu Yong Li Liping Chen Shuyue Li Juan Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第4期1203-1212,I0007,共10页
Advanced cathode materials are urgently required for the sustainable development of high-energydensity secondary batteries.As a promising candidate,the electrochemical performance of LiNi0.8Co0.1Mn0.1O2(LN... Advanced cathode materials are urgently required for the sustainable development of high-energydensity secondary batteries.As a promising candidate,the electrochemical performance of LiNi0.8Co0.1Mn0.1O2(LNCM)should be further optimized to reach the market demand due to its rapid decay issue.Herein,a series of trace Yb3+-doping LNCM-Yb(x)(x=1 mol%-10 mol%)samples was prepared through a typical hydrothermal method.X-ray diffraction(XRD)patterns confirm that the crystal structure of LNCM-Yb(x)remains basically identical with the pristine LiNiO2-phased LNCM,but a well-distributed associated LiYbO2phase is also indexed.Relying on the introduced Yb3+and generated LiYbO2,it is found that the Li+diffusion coefficient and conductivity are co-modulated,thus the rate and cycling performances are obviously enhanced,where LNCM-Yb3displays an enhanced rate capacity of 191 mAh/g at the first 0.1C and 181 mAh/g at the finial 0.1C,delivering the capacity retention of 94.76%after 60 cycles.Also,LNCM-Yb3conveys a nice capacity retention of 68.02%after 300 cycles at 1C,compared with LNCM(6.47%after 200 cycles).The formation mechanism and atomic substitution relationship are then obtained by density functional theory calculations.Therefore,it is expected to provide a useful guideline to promote the development of LNCM-based cathode towards secondary batteries. 展开更多
关键词 Secondary batteries LiNi0.8Co0.1Mn0.1O2 Rare earths Yb3+-doping LiYbO2 Enhanced capacity retention
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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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First-principles investigation on N/C co-doped CeO2 认领 引用
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作者 任荣康 张明举 +3 位作者 彭健 牛猛 李健宁 郑树凯 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第3期384-387,共4页
The N and C doping effects on the crystal structures, electronic and optical properties of fluorite structure CeO2 have been investigated using the first-principles calculation. Co-doping these two elements results in... The N and C doping effects on the crystal structures, electronic and optical properties of fluorite structure CeO2 have been investigated using the first-principles calculation. Co-doping these two elements results in the local lattice distortion and volume expansion of CeO2. Compared with the energy hand structure of pure CeO2, some local energy levels appear in the forbidden band, which may facilitate the light absorption. Moreover, the enhanced photo-catalytic properties of CeO2 were explained through the absorption spectra and the selection rule of the band-to-band transitions. 展开更多
关键词 first-principles N/C co-doped CeO2 photo-catalytic activity
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The Role of CeO2-Doping of Fe2O3/Co3O4System on Its Structural Characteristics 认领 引用 被引量：1
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作者 Neven A. Hassan Gehan A. Fagal +1 位作者 Abdelrahman A. Badawy Gamil A. El-Shobaky 《Open Journal of Applied Sciences》 2013年第1期92-99,共8页
The role of ceria doping (0.75 - 3 mol%) on solid-solid interactions between ferric and cobaltic oxides was investigated. The investigated solids were characterized by TGA, DTA, XRD and HRTEM. The results revealed tha... The role of ceria doping (0.75 - 3 mol%) on solid-solid interactions between ferric and cobaltic oxides was investigated. The investigated solids were characterized by TGA, DTA, XRD and HRTEM. The results revealed that ceria much enhanced the formation of nanosized CoFe2O4 (10 - 30 nm). The stimulation effect of ceria towards cobalt ferrite formation was evidenced from analysis of DTA and XRD investigations. In fact, the area of endothermic peak located at 575℃- 680℃ relative to solid-solid interaction between ferric and cobaltic oxide increased by increasing the dopant concentration. This treatment decreased the activation energy of formation of the produced ferrite from 33 - 9.2 kJ/mol upon doping with 3 mol% CeO2. HRTEM analysis revealed the formation of homogenous nanosized CoFe2O4. The formation effect of ceria dopant towards the formation of CoFe2O4 has been tentatively attributed to an effective increase in the mobility of the reacting cations. 展开更多
关键词 Cobalt Ferrite CeO2-Dopant HRTEM Coprecipitation
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst 认领 引用 被引量：11
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作者 Chengqiang Zheng Teng Cheng +2 位作者 Linjun Yang Hao Wu Hongmei Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期279-291,共13页
The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition beha... The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 展开更多
关键词 CeO2-doped SCR catalyst SiO2 addition NH4HSO4 decomposition SO2 poisoning Cerium sulfate
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纳米CeO_2吸附剂的制备及对六价铬的吸附性能 认领 引用 被引量：9
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作者 张金洋 黄敏 +3 位作者 李琴 刘敏 付孝锦 雷光东 《人工晶体学报》 CAS CSCD 北大核心 2018年第8期1662-1669,共8页
吸附法是去除水中重金属离子的重要方法,开发新型吸附剂一直是研究热点。利用浸渍法和水热法制备了片状和无定形的纳米CeO_2吸附剂,探讨其对六价铬的吸附性能,分析pH、吸附时间、六价铬初始浓度等因素对其吸附性能的影响,并通过循环吸... 吸附法是去除水中重金属离子的重要方法,开发新型吸附剂一直是研究热点。利用浸渍法和水热法制备了片状和无定形的纳米CeO_2吸附剂,探讨其对六价铬的吸附性能,分析pH、吸附时间、六价铬初始浓度等因素对其吸附性能的影响,并通过循环吸附实验考察纳米CeO_2吸附剂的再生能力。结果表明:厚度30 nm、直径大小约为400nm的片状CeO_2吸附剂具有更强的吸附能力和更快的吸附速率,80 min时基本达到吸附平衡;两种吸附剂的最佳吸附pH为3;吸附动力学均符合伪二级动力学方程,Langmuir模型和Freundlich模型均能很好地拟合等温吸附过程,表明纳米CeO_2对六价铬的吸附以单层吸附为主。片状CeO_2四次吸附-解吸实验之后吸附率稍有下降,表明片状CeO_2吸附剂有较好的再生能力,因而,该片状CeO_2吸附剂适用于与酸性Cr(Ⅵ)废水的处理。 展开更多
关键词 片状CeO2 无定型CeO2 六价铬 吸附
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Catalytic Oxidative Properties and Characterization of CuO/CeO_2 Catalysts 认领 引用 被引量：8
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作者 蒋晓原 周仁贤 +2 位作者 袁骏 吕光烈 郑小明 《Journal of Rare Earths》 SCIE EI CAS 2003年第1期55-59,共5页
The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that eith... The oxidative properties and characterization of CuO, CeO 2 and CuO/CeO 2 cata lysts were examined by means of a CO micro-reactor GC system, TPR, XPS and X-r ay diffraction Rietveld methods. The results show that either CuO or CeO 2 ac tivity is quite low for CO oxidation. However, when CuO and CeO 2 are mixed, the oxidative activity of the catalyst increases significantly, probably owing to the valency status of copper species (Cu 2+ and Cu+) on the CeO 2 surfa ce, the dispersion and reducibility. XPS surface analysis shows that CuO loading is very important in forming of either Cu 2+ or Cu+. Rietveld analysis s hows that some CuO, which has smaller ion radius than Ce 4+, enters the Ce O 2 lattice after CuO and CeO 2 are mixed. When the CuO loading reaches 5.0%, the size of CuO crystals is a minimum (6.1 nm) and the micro-strain value i s a maximum (2.86×10 -3), resulting in high surface energy and the best ac tivity for CO oxidation. 展开更多
关键词 physical chemistry CuO/CeO 2 catalysts CO micro-reactor GC system rare earths
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Preparation and photocatalytic activity of Cu2+-doped TiO2/SiO2 认领 引用 被引量：9
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作者 Ru-fen Chen Cui-xuan Zhang +1 位作者 Juan Deng Guo-qiang Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2009年第2期220-225,共6页
Cu^2+-doped nanostructured TiO2-coated SiO2(TiO2/SiO2)particles were prepared by the layer-by-layer assembly technique and their photocatalytic property was studied.TiO2 colloids were synthesized by the sol-gel method... Cu^2+-doped nanostructured TiO2-coated SiO2(TiO2/SiO2)particles were prepared by the layer-by-layer assembly technique and their photocatalytic property was studied.TiO2 colloids were synthesized by the sol-gel method using TiOSO4 as a precursor.The experimental results showed that TiO2 nanopowders on the surface of SiO2 particles were well distributed and compact.The amount of TiO2 increased with the increase in coating layers.The shell structure appeared to be composed of anatase titania nanocrystals at 550℃.The 2-layer coated TiO2 particles on the surface showed a higher degradation rate compared with all the different-layer samples.The photocatalytic activity of Cu^2+-doped TiO2/SiO2 was higher than that ofundoped TiO2/SiO2.The optimum dopant content was about 0.10wt%. 展开更多
关键词 nanostructured TiO2 SiO2 particles layer-byqayer assembly Cu^2+-doped photocatalytic activity
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CeO2对激光熔覆TiCp/Ni基复合涂层的影响 认领 引用 被引量：12
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作者 许伯藩 李安敏 +1 位作者 潘应君 张细菊 《热加工工艺》 北大核心 2002年第6期10-12,共3页
利用5kWCO2激光器在A3钢表面激光熔覆添加不同CeO2含量的TiCp/Ni复合涂层。研究了稀土氧化物对激光熔覆金属陶瓷复合涂层的组织结构与性能的影响。结果表明,预涂覆复合合金粉末中添加0.4%CeO2能减少涂层的气孔、疏松,使涂层的组织致密... 利用5kWCO2激光器在A3钢表面激光熔覆添加不同CeO2含量的TiCp/Ni复合涂层。研究了稀土氧化物对激光熔覆金属陶瓷复合涂层的组织结构与性能的影响。结果表明,预涂覆复合合金粉末中添加0.4%CeO2能减少涂层的气孔、疏松,使涂层的组织致密及涂层中TiC颗粒细小光滑,分布均匀,复合涂层的耐磨性与耐蚀性得到显著提高。 展开更多
关键词 激光熔覆 稀土氧化物CeO2 金属陶瓷涂层 耐磨性 耐蚀性
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CeO_2/ACF的低温SCR烟气脱硝性能研究 认领 引用 被引量：58
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作者 沈伯雄 郭宾彬 +2 位作者 史展亮 吴春飞 梁材 《燃料化学学报》 北大核心 2007年第1期125-128,共4页
The selective catalytic reduction(SCR) of NOx using MnOx and CeO2 supported on viscose-based active carbon fibers(ACF) at 120 ℃～270 ℃ relatively lower than the temperature when using V2O5/TiO2-anatase catalyst was ... The selective catalytic reduction(SCR) of NOx using MnOx and CeO2 supported on viscose-based active carbon fibers(ACF) at 120 ℃～270 ℃ relatively lower than the temperature when using V2O5/TiO2-anatase catalyst was studied.As a result,CeO2/ACF shows a better catalysis than MNOx/ACF,which is not affected by the reaction temperature. NO conversion of 85% is reached with the 10%-CeO2/ACF catalyst at the whole temperature window.Furthermore,a series of MnOx-CeO2/ACF composite catalysts were studied.The results show that the loading method of catalyst affects its activity. 展开更多
关键词 低温SCR CeO2 ACF
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CeO_2对激光熔敷合金层组织和腐蚀磨损性能的影响 认领 引用 被引量：3
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作者 王顺兴 郑世安 +2 位作者 赵涛 董企铭 张一民 《钢铁研究学报》 CAS 北大核心 2000年第3期47-50,共4页
用 X射线衍射仪、SEM、TEM和电子探针研究了稀土氧化物 Ce O2 对 Ni6 0 - WC激光熔敷层的相结构、显微组织以及腐蚀磨损性能的影响。试验结果表明 ,Ni6 0 +2 0 % WC+0 .5 % Ce O2 熔敷层的抗腐蚀磨损性能最好。
关键词 激光熔敷层 CeO2 显微组织 腐蚀磨损性能
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