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Surface dynamic reconstruction of Ni-based catalysts for electrooxidation reaction 认领 引用
1
作者 Cheng Wang Li Zhou +2 位作者 Zhenghao Fei Yanqing Wang Yukou Du 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第12期137-151,共15页
Ni-based materials,widely recognized for their exceptional catalytic properties,experience structural transformations that profoundly influence their performance characteristics and operational stability.To deeply und... Ni-based materials,widely recognized for their exceptional catalytic properties,experience structural transformations that profoundly influence their performance characteristics and operational stability.To deeply understand the reconstruction mechanism of Ni-based catalysts,this review systematically summarizes the advanced strategies tailoring the dynamic reconstruction process,including electrochemical activation,defect engineering,partial etching,ionic doping,and heterostructure construction.Furthermore,we discuss the implications of these surface transformations on catalytic activity,highlighting their role in optimizing reaction pathways and enhancing overall efficiency in various electrooxidation reactions,such as oxygen evolution reaction(OER),urea oxidation reaction(UOR),glycerol oxidation reaction(GOR),hydroxymethylfurfural oxidation reaction(HMFOR),and ammonia oxidation reaction(AOR).By summarizing recent research findings,this review aims to provide a systematical summary of how surface dynamics can be harnessed to improve the design of Ni-based catalysts for a variety of electrooxidation applications,paving the way for advancements in energy conversion and storage technologies. 展开更多
关键词 Surface dynamic reconstruction Ni-based catalysts In situ Reconstruction strategies Electrooxidation
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A review of recent progress on CO2hydrogenation to methane by Ni-based catalysts supported on carbon materials 认领 引用
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作者 SUN Yu HUO Kai-xuan +2 位作者 FANG Hai-qiu WANG Yang WU Ming-bo 《新型炭材料（中英文）》 SCIE EI CAS CSCD 北大核心 2025年第6期1201-1218,共18页
Recent research progress on the use of Ni-based catalysts supported by various carbon materials,such as carbon nanotubes,graphene,and activated carbon,for the hydrogenation of CO2to CH4is summarized.The influenc... Recent research progress on the use of Ni-based catalysts supported by various carbon materials,such as carbon nanotubes,graphene,and activated carbon,for the hydrogenation of CO2to CH4is summarized.The influence of additives and surface modification methods on improving their catalytic performance is discussed as is the reaction mechanism,especially the structurefunction relationship produced by the carbon.The review provides a comprehensive directory for the rational design of carbon-supported Ni-based catalysts for the methanation of CO2. 展开更多
关键词 Carbon dioxide hydrogenation Carbon materials Ni-based catalysts Methanation Reaction mechanism
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Research progress on metal-support interactions over Ni-based catalysts for CH4-CO2reforming reaction 认领 引用 被引量：1
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作者 SUN Kai JIANG Jianfei +4 位作者 LIU Zixuan GENG Shiqi LIU Zhenmin YANG Jiaqian LI Shasha 《燃料化学学报（中英文）》 EI CAS CSCD 北大核心 2025年第4期434-451,共18页
With ongoing global warming and increasing energy demands,the CH4-CO2reforming reaction(dry reforming of methane,DRM)has garnered significant attention as a promising carbon capture and utilization technology.Ni... With ongoing global warming and increasing energy demands,the CH4-CO2reforming reaction(dry reforming of methane,DRM)has garnered significant attention as a promising carbon capture and utilization technology.Nickel-based catalysts are renowned for their outstanding activity and selectivity in this process.The impact of metal-support interaction(MSI),on Ni-based catalyst performance has been extensively researched and debated recently.This paper reviews the recent research progress of MSI on Ni-based catalysts and their characterization and modulation strategies in catalytic reactions.From the perspective of MSI,the effects of different carriers(metal oxides,carbon materials and molecular sieves,etc.)are introduced on the dispersion and surface structure of Ni active metal particles,and the effect of MSI on the activity and stability of DRM reactions on Ni-based catalysts is discussed in detail.Future research should focus on better understanding and controlling MSI to improve the performance and durability of nickel-based catalysts in CH4-CO2reforming,advancing cleaner energy technologies. 展开更多
关键词 CO2utilization CH4-CO2reforming Ni-based catalysts metal-support interactions supports
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Carbon diffusion mechanism as an effective stability enhancement strategy:The case study of Ni-based catalyst for photothermal catalytic dry reforming of methane 认领 引用
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作者 Dezheng Li Huimin Liu +3 位作者 Xuewen Xiao Manqi Zhao Dehua He Yiming Lei 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第3期399-409,共11页
Photothermal catalytic methane dry reforming(DRM)technology can convert greenhouse gases(i.e.CH4and CO2)into syngas(i.e.H2and CO),providing more opportunities for reducing the greenhouse effect and achieving ... Photothermal catalytic methane dry reforming(DRM)technology can convert greenhouse gases(i.e.CH4and CO2)into syngas(i.e.H2and CO),providing more opportunities for reducing the greenhouse effect and achieving carbon neutrality.In the DRM field,Ni-based catalysts attract wide attention due to their low cost and high activity.However,the carbon deposition over Ni-based catalysts always leads to rapid deactivation,which is still a main challenge.To improve the long-term stability of Ni-based catalysts,this work proposes a carbon-atom-diffusion strategy under photothermal conditions and investigates its effect on a Zn-doped Ni-based photothermal catalyst(Ni3Zn@CeO2).The photothermal catalytic behavior of Ni3Zn@CeO2can maintain more than 70 h in DRM reaction.And the photocatalytic DRM activity of Ni3Zn@CeO2is 1.2 times higher than thermal catalytic activity.Density functional theory(DFT)calculation and experimental characterizations indicate that Ni3Zn promotes the diffusion of carbon atoms into the Ni3Zn to form the Ni3ZnC0.7 phase with body-centered cubic(bcc)structure,thus inhibiting carbon deposition.Further,in-situ diffuse reflectance infrared Fourier transform(DRIFT)spectroscopy and DFT calculation prove Ni3Zn@CeO2benefits the CH4activation and inhibits the carbon deposition during the DRM process.Through inducing carbon atoms diffusion within the Ni3Zn lattice,this work provides a straightforward and feasible strategy for achieving efficient photothermal catalytic DRM and even other CH4conversion implementations with long-term stability. 展开更多
关键词 Photothermal catalysis Methane dry reforming Ni-based catalyst Stability enhancement Carbon atom diffusion
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Tuning the properties of Ni-based catalyst via La incorporation for efficient hydrogenation of petroleum resin 认领 引用 被引量：4
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作者 Qunhong Liu Jiangtao Yang +5 位作者 Hongwei Zhang Hongming Sun Shuzheng Wu Bingqing Ge Rong Wang Pei Yuan 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第5期41-50,共10页
The hydrogenation of petroleum resin(PR)is an effective process to prepare high value-added hydrogenated PR(HPR).However,the preparation of non-noble metal-based catalysts with high catalytic activity for PR hydrogena... The hydrogenation of petroleum resin(PR)is an effective process to prepare high value-added hydrogenated PR(HPR).However,the preparation of non-noble metal-based catalysts with high catalytic activity for PR hydrogenation still remains a challenge.Herein,a La promoted Ni-based catalyst is reported through the thermal reduction of quaternary Ni La Mg Al-layered double hydroxides(Ni La Mg Al-LDHs).The incorporation of La is beneficial to the reduction and stability of Ni particles with reduced particle size,and the increased alkalinity effectively mitigates the breakage of molecular chains of PR.As a result,the La promoted Ni-based catalyst exhibits high catalytic activity and excellent stability for PR hydrogenation.A hydrogenation degree of 95.4%and 96.1%can be achieved for HC5PR and HC9 PR with less reduced softening point,respectively.Notably,the hydrogenation degree still maintains at 92.7%even after 100 hours’reaction,much better than that without La incorporation or prepared using conventional impregnation method. 展开更多
关键词 Ni-based catalyst Layered double hydroxides Promotion effect Petroleum resin Hydrogenation
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Studies on Catalysis in Partial Oxidation of Methane to Syngas(Ⅰ)──Performance and Characterization of Ni-based Catalysts 认领 引用 被引量：2
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作者 CHEN Ping ZHANG Hong-bin LIN Guo-dong and TSAI Khi-rui 《Chemical Research in Chinese Universities》 SCIE EI CAS 1996年第1期70-80,共11页
Highly active and selective Ni-based catalysts for partial oxidation of methane (POM) to syngas (CO/H,) have been studied and developed. Spectroscopic characterization by XRD, XPS, EPR, etc. demonstrated that under th... Highly active and selective Ni-based catalysts for partial oxidation of methane (POM) to syngas (CO/H,) have been studied and developed. Spectroscopic characterization by XRD, XPS, EPR, etc. demonstrated that under the POM reaction conditions, the Ni-components of the catalysts investigated were reduced and enriched on the surface to form metallic Ni0-phase. A comparative study of the first series of transition-metals showed that only Ni and Co have a high POM activity and selectivity, whereas the others (including Mn, Fe, Cu, etc. ) give mainly complete combustion products, Co, and H2O. The results favor the following viewpoints: the PoM activity is related with the rapidly changeable valence transitionmetal sites, M0/M2+ (e. g. Ni0/Ni2+ ), on the surface of the functioning catalysts;the transition-metal sites in zero-valence state seem to be responsible for the activation and dehydrogenation of methane by homolytic splitting of its C-H bonds on these sites. and the nature of rapidly changeable valence of the active sties is requisite for activation and rapid conversion of dioxygen. 展开更多
关键词 Partial oxidation of methane Syngas Ni-based catalysts
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Improvement of catalytic stability for CO_2 reforming of methane by copper promoted Ni-based catalyst derived from layered-double hydroxides 认领 引用 被引量：7
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作者 Bing Li Zhenxin Xu +3 位作者 Fangli Jing Shizhong Luo Ning Wang Wei Chu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第6期1078-1085,共8页
Copper-promoted nickel-based metal nanoparticles (NPs) with high dispersion and good thermal stability were derived from layered-double hydroxides (LDHs) precursors that were facilely developed by a co-precipitation s... Copper-promoted nickel-based metal nanoparticles (NPs) with high dispersion and good thermal stability were derived from layered-double hydroxides (LDHs) precursors that were facilely developed by a co-precipitation strategy. The copper-promoted Ni-based metal NPs catalysts were investigated for methane reforming with carbon dioxide to hydrogen and syngas. A series of characterization techniques including XRD, N2adsorption and desorption, H2-TPR, XPS, CO2-TPD, TEM, TGA and in situ CH4-TPSR were utilized to determine the structure-function relationship for the obtained catalysts. The copper addition accelerated the catalyst reducibility as well as the methane activation, and made the Ni species form smaller NPs during both preparation and reaction by restricting the aggregation. However, with higher copper loading, the derived catalysts were less active during methane reforming with CO2to syngas. It was confirmed that the catalyst with 1 wt% Cu additive gave the higher catalytic activity and remained stable during long time reaction with excellent resistance to coking and to sintering. Furthermore, the mean size of metal NPs changed minimally from 6.6 to 7.9 nm even after 80 h of time on stream at temperature as high as 700 °C for this optimized catalyst. Therefore, this high dispersed anti-coking copper-promoted nickel catalyst derived from LDHs precursor could be prospective catalyst candidate for the efficient heterogeneous catalysis of sustainable CO2conversion. © 2016 Science Press 展开更多
关键词 Carbon dioxide Catalysis Catalysts Copper Metal nanoparticles Methane Nickel Precipitation (chemical) Sintering Synthesis gas
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Synthesis, characterization and catalytic methanation performance of modified kaolin-supported Ni-based catalysts 认领 引用 被引量：5
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作者 Jiao Liu Chuanyue Zheng +1 位作者 Junrong Yue Guangwen Xu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期2953-2959,共7页
Kaolin as a raw material for mesoporous support was firstly modified by calcination,acid treatment,and then was used to prepare nickel catalysts.The amount of alumina which was activated in kaolin during thermal treat... Kaolin as a raw material for mesoporous support was firstly modified by calcination,acid treatment,and then was used to prepare nickel catalysts.The amount of alumina which was activated in kaolin during thermal treatment and then leached out in the acid was different.XRD pattern of the kaolin calcined at 600°C or 900°C exhibited only the diffraction peaks for amorphous silica and quartz while that calcined at 1100°C showed obvious peaks forγ-Al2 O3.Therefore,the nickel-based catalysts exhibited different physic-chemical properties.Atmospheric syngas methanation over the catalysts clarified an activity order of CA-1100 N CA-900 N CA-1400 N CA-600 N KA≈0 at temperatures of 350–650°C and a space velocity of 120 L·g-1·h-1.Metallic nickel with small diameter which has medium interaction with the modified kaolin and is well dispersed on the support would have reasonably good activity and carbon-resistance for syngas methanation. 展开更多
关键词 Methanation Kaolin Catalyst Catalyst support Leaching
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Highly selective hydrogenation of halonitroaromatics to aromatic haloamines by ligand modified Ni-based catalysts 认领 引用 被引量：2
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作者 Chun Shan Lu Jing Hui Lv +3 位作者 Lei Ma Qun Feng Zhang Feng Feng Xiao Nian Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2012年第5期545-548,共4页
Ligand modification of Ni-based catalysts by coordination of dicyandiamide to Ni metal leads to enhanced selectivity for the selective hydrogenation of halonitroaromatics.The selectivity of above 99.9%to aromatic halo... Ligand modification of Ni-based catalysts by coordination of dicyandiamide to Ni metal leads to enhanced selectivity for the selective hydrogenation of halonitroaromatics.The selectivity of above 99.9%to aromatic haloamines can be achieved at the conversion of 100%.The results of H_2-TPD and FT-IR experiments show that Ni^-H~＋ species possessing the properties of Lewis acid site on the surface of Raney Ni could be responsible for the hydrodehalogenation.When Raney Ni was treated by dicyandiamide,Ni^-H~＋ species interacted with N atom from the dicyandiamide.This interaction was stable even at reaction temperature,which reduced the possibility to form the intermediate state of Ar-Cl...H~＋Ni^-.And then C-Cl bond could not be polarized and activated.The hvdrodechlorination process was suppressed effectively. 展开更多
关键词 Halonitroaromatics Hydrogenation Ni catalyst Hydrodehalogenation
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Sorbitol Hydrogenolysis to Glycols over Baisic Additive Promoted Ni-based Catalysts 认领 引用 被引量：2
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作者 Xiao-feng Cao Qi Zhang +4 位作者 Dong Jiang Qi-ying Liu Long-long Ma Tie-jun Wang De-bao Li 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2015年第3期338-344,I0002,共7页
A series of Ni based catalysts with different supports and basic additives were prepared by sequential impregnation method. The catalysts were characterized by XRD, BET, H2-TPR and CO2-TPD techniques. It was found tha... A series of Ni based catalysts with different supports and basic additives were prepared by sequential impregnation method. The catalysts were characterized by XRD, BET, H2-TPR and CO2-TPD techniques. It was found that the introduction of basic additives enhanced the basicities of catalyats and promoted the dispersities of Ni particles by strong interaction between Ni2＋ and basic additives. Among the Ni based catalysts, 10%Ni/10%La203/ZrO2 showed the superior performance in sorbitol hydrogenolysis. The synergistic effect of Ni and La203 was proven to play an essential role in selective synthesis of EG and 1,2-PG. In the optimal reaction condition, the catalyst presented 100% sorbitol conversion and over 48% glycols （EG and 1,2-PG） yield. The kinetics study of polyols （sorbitol, xylitol and glycerol） hydrogenolysis showed that polyols with more hydroxyl number have higher activity and products distribution was final results of kinetic balance, which could give us some inspiration abeut how to change the products selectivity. 展开更多
关键词 Sorbitol hydrogenolysis Glycols Ni catalyst Support Base promoter
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Catalytic methanation of syngas over Ni-based catalysts with different supports 认领 引用 被引量：4
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作者 Yincong Liu Lingjun Zhu +5 位作者 Xiaoliu Wang Shi Yin Furong Leng Fan Zhang Haizhou Lin Shurong Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第5期602-608,共7页
Co-precipitation method was selected for the preparation of Ni/Al_2O_3, Ni/ZrO_2 and Ni/CeO_2 catalysts, and their performances in methanation were investigated in this study. The structure and surface properties of t... Co-precipitation method was selected for the preparation of Ni/Al_2O_3, Ni/ZrO_2 and Ni/CeO_2 catalysts, and their performances in methanation were investigated in this study. The structure and surface properties of these catalysts were characterized by BET, XRD, H_2-TPD, TEM and H_2-TPR. The results showed that the catalytic activity at low temperature followed the order: Ni/Al_2O_3>Ni/ZrO_2>Ni/CeO_2. Ni/Al_2O_3 catalyst presented the best catalytic performance with the highest CH_4 selectivity of 94.5%. The characterization results indicated that the dispersion of the active component Ni was the main factor affecting the catalytic activity and the one with higher dispersion gave better performance. 展开更多
关键词 Methanation Ni dispersion Catalytic activity Catalyst support Stability
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Catalytic steam reforming of biomass over Ni-based catalysts:Conversion from poplar leaves to hydrogen-rich syngas 认领 引用 被引量：2
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作者 Lingyan Cao Zhigang Jia +1 位作者 Shengfu Ji Jinyong Hu 《Journal of Natural Gas Chemistry》 CSCD 2011年第4期377-383,共7页
A series of Ni/SBA-15 catalysts with Ni contents from 5 wt%–20 wt%and CaO-12.5%Ni/SBA-15 catalysts with CaO contents from 1.4 wt%–9.8 wt%have been prepared.The structure of the catalysts was characterized using X-ra... A series of Ni/SBA-15 catalysts with Ni contents from 5 wt%–20 wt%and CaO-12.5%Ni/SBA-15 catalysts with CaO contents from 1.4 wt%–9.8 wt%have been prepared.The structure of the catalysts was characterized using X-ray diffraction(XRD),N2 adsorption-desorption,transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).The performance of catalytic steam reforming of the poplar leaves to the hydrogen-rich syngas was tested in a fixed-bed reactor.The results indicate that the 7.0wt%CaO-12.5wt%Ni/SBA-15 catalyst exhibits the best performance for the catalytic steam reforming of poplar leaves to hydrogen-rich syngas.The ratio of H2:CO can reach ca 5:1 in the hydrogen-rich syngas.The yield of H2 can reach 273.30 mL/g(poplar leaves).In the CaO-Ni/SBA-15 catalyst,Ni active component mainly fills the role of catalytic steam reforming of the poplar leaves,and CaO active component mainly plays the role as water-gas shift and CO2 sorbent. 展开更多
关键词 biomass steam reforming hydrogen-rich syngas Ni-basic catalyst CaO
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Insight into MgO promoter with low concentration for the carbon-deposition resistance of Ni-based catalysts in the CO_2 reforming of CH_4 认领 引用 被引量：7
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作者 Xiangdong Feng Jie Feng Wenying Li 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第1期88-98,共11页
The CO2reforming of CH4is studied over MgO‐promoted Ni catalysts,which were supported on alumina prepared from hydrotalcite.This presents an improved stability compared with non‐promoted catalysts.The introduction o... The CO2reforming of CH4is studied over MgO‐promoted Ni catalysts,which were supported on alumina prepared from hydrotalcite.This presents an improved stability compared with non‐promoted catalysts.The introduction of the MgO promoter was achieved through the‘‘memory effect’’of the Ni‐Al hydrotalcite structure,and ICP‐MS confirmed that only0.42wt.%of Mg2+ions were added into the Ni‐Mg/Al catalyst.Although no differences in the Ni particle size and basicity strength were observed,the Ni‐Mg/Al catalyst showed a higher catalytic stability than the Ni/Al catalyst.A series of surface reaction experiments were used and showed that the addition of a MgO promoter with low concentration can promote CO2dissociation to form active surface oxygen arising from the formation of the Ni‐MgO interface sites.Therefore,the carbon‐resistance promotion by nature was suggested to contribute to an oxidative environment around Ni particles,which would increase the conversion of carbon residues from CH4cracking to yield CO on the Ni metal surface.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved. 展开更多
关键词 CO2 reforming of CH4 Carbon‐deposition resistant Activation of CO2 Ni‐based catalyst Low concentration MgO promoter
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Influences of synthesis methods and modifier addition on the properties of Ni-based catalysts supported on reticulated ceramic foams 认领 引用
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作者 Vesna Nikolic Zeljko Kamberovic +3 位作者 Zoran Antic Marija Korac Miroslav Sokic Vesna Maksimovic 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第8期806-812,共7页
A method of synthesizing Ni-based catalysts supported on α-Al2O3-based foams was developed. The foams were impregnated with aqueous solutions of metal chlorides under an air atmosphere using an aerosol route. Separat... A method of synthesizing Ni-based catalysts supported on α-Al2O3-based foams was developed. The foams were impregnated with aqueous solutions of metal chlorides under an air atmosphere using an aerosol route. Separate procedures involved calcination to form oxides and drying to obtain chlorides on the foam surface. The synthesized samples were subsequently reduced with hydrogen. With respect to the Ni/Al2O3 catalysts, the chloride reduction route enabled the formation ofa Ni coating without agglomerates or cracks. Further research included catalyst modification by the addition of Pd, Cu, and Fe. The influences of the additives on the degree of reduction and on the low-temperature reduction effectiveness （533 and 633 K） were examined and compared for the catalysts obtained from oxides and chlorides. Greater degrees of reduction were achieved with chlorides, whereas Pd was the most effective modifier among those investigated. The reduction process was nearly complete at 533 K in the sample that contained 0.1wt% Pd. A lower reduction temperature was utilized, and the calcination step was avoided, which may enhance the economical and technological aspects of the developed catalyst production method. 展开更多
关键词 catalysts nickel ceramic foams modification aerosol process catalytic properties
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Ni-based catalysts obtained from perovskites oxides for ethanol steam reforming 认领 引用
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作者 Fabiola Nerina Agüero Jose Antonio Alonso +1 位作者 Maria Teresa Fernández-Díaz Luis Eduardo Cadus 《燃料化学学报》 CSCD 北大核心 2018年第11期1332-1341,共10页
Perovskites as host structures of cations were used in order to generate in situ active and stable catalysts for ethanol steam reforming. For this purpose,La1-xMg_xAl1-yNi_yO_3(x = 0.1; y = 0,0.1,0.2,0.3) perovs... Perovskites as host structures of cations were used in order to generate in situ active and stable catalysts for ethanol steam reforming. For this purpose,La1-xMg_xAl1-yNi_yO_3(x = 0.1; y = 0,0.1,0.2,0.3) perovskites were synthetized by the citrate method.Ni segregation is evident for a substitution level higher than 0. 2. The segregation of Ni as NiO generated species interacts with different metal-support after the reduction step. The y = 0.1 catalyst presents the highest H_2 yield value about 85% during reaction time,with low mean values of CH_4 and CO selectivities of 3.4% and 11%,respectively and a low carbon formation. The better performance of y = 0.1 catalyst could be attributed to the minor proportion of segregated phases,thus a controlled expulsion of Ni is successfully reached. 展开更多
关键词 perovskites catalyst design ethanol steam reforming
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Effect of RE-Doped and RE Quantity of Ni-Based Catalysts on CH4/CO2 Reforming Reaction 认领 引用
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作者 Yang Yifeng Li Xiancai Dai Chao Wang Chunfeng Chen Juanrong 《Journal of Rare Earths》 SCIE EI CAS 2004年第Z1期165-168,共4页
RE-doped Ni-based catalysts were prepared by sol-gel method.These catalysts were applied to the reaction of CO2 reforming CH4 to syngas.The studies reveal that RE-doped ( RE = La, Ce, Sm, Yb) Ni-based catalysts show h... RE-doped Ni-based catalysts were prepared by sol-gel method.These catalysts were applied to the reaction of CO2 reforming CH4 to syngas.The studies reveal that RE-doped ( RE = La, Ce, Sm, Yb) Ni-based catalysts show higher catalytic activity than undoped Ni-based catalyst, and with the increasing of RE-doped quantity, the catalytic activity of catalysts exhibits regular changes.When RE-doped quantity is 0.2% ( molar ratio), the catalysts show the best catalytic activity. 展开更多
关键词 dope BaTiO3 catalyst rare earths
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Stress-rupture behavior of a Ni-based Re-containing single crystal superalloy in[001]and[111]orientations at 1100℃ 认领 引用 被引量：1
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作者 Guang-lei Wang Dong-qing Qi +1 位作者 Jin-lai Liu Ji-de Liu 《China Foundry》 SCIE EI CAS CSCD 2026年第2期179-185,共7页
Turbine blades,due to their intricate geometry,are exposed to multiaxial stresses during operation.Consequently,it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenar... Turbine blades,due to their intricate geometry,are exposed to multiaxial stresses during operation.Consequently,it is imperative to examine the anisotropy of their stress-rupture behavior across various testing scenarios,particularly under high-temperature conditions.Stress-rupture behavior of a Ni-based single crystal superalloy was investigated under a load varying from 100 MPa to 137 MPa at 1,100℃ for both[001]-and[111]-orientated specimens.Results demonstrate that the rupture behavior of[111]-orientated specimens exhibits obviously higher sensitive to applied stress compared to[001]-orientated specimens.This difference is primarily attributed to the orientation dependentγ'coarsening behavior and distinct dislocation interactions atγ/γ'interfaces.In[001]-oriented specimens,plate-likeγ/γ'rafts rapidly form alongside well-developed interfacial dislocation networks,where theγ/γ'misfit stress dominates the microstructural evolution.In contrast,the[111]-orientated specimens exhibit retained,coarsenedγ'precipitates embedded within theγmatrix,accompanied by poorly developed interfacial dislocation networks. 展开更多
关键词 Ni-based single crystal superalloy stress-rupture behavior deformation mechanism stress dependence orientation dependence
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Stray grains evolution and high-temperature stress rupture behavior of crystallographic lamellar microstructure in Ni-based superalloys prepared by laser powder bed fusion 认领 引用
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作者 Peng Wang Jing-jing Liang +10 位作者 Yu-ping Zhu Wei Song Qiao-lei Li Yi Qiu Ying-ju Li Yi-zhou Zhou Han-lin Liao Lei Shi Li-ming Lei Xiao-feng Sun Jin-guo Li 《China Foundry》 SCIE EI CAS CSCD 2026年第1期45-54,共10页
The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature... The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature stress rupture behavior and use these findings to improve the additive manufacturing process.The result shows that the high temperature-induced intergranular fracture in grain region is responsible for stress rupture failure under both conditions of 760 ℃/780 MPa and 980 ℃/260 MPa.Among them,the sub-grain boundary fracture occurs only under high temperature and low stress,980 ℃/260 MPa.Due to the severe intergranular fracture induced by stray grains,the stress rupture life is very low under both conditions.According to the finite element simulation,the formation of stray grains stems from the unstable heat flow within the melt pool during the process.In addition,the shorter stress rupture lifetime does not excite a more pronounced dislocation network around the γ′ phase.However,the deformation twins can still be activated inside the grains,so it has excellent plasticity under both test conditions.Finally,this work indicates that the future optimization of CLM by LPBF should focus on eliminating of high-angle grain boundaries in grains. 展开更多
关键词 crystallographic lamellar microstructure Ni-based superalloys additive manufacturing mechanical properties
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Characteristics and formation mechanism of non-metallic inclusion clusters in vacuum arc remelted Ni-based superalloys 认领 引用
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作者 Yu Gu Kai-Xuan Gui +1 位作者 Peng Zhao Shu-Feng Yang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第5期18-32,共15页
A quantitative study of inclusions in an industrial superalloy ingot produced by vacuum arc remelting(VAR)was conducted,and the characteristics as well as the formation mechanism of non-metallic inclusion clusters wer... A quantitative study of inclusions in an industrial superalloy ingot produced by vacuum arc remelting(VAR)was conducted,and the characteristics as well as the formation mechanism of non-metallic inclusion clusters were discussed.Results showed that inclusions within the VAR ingot primarily consisted of individual nitrides and composite inclusions such as oxide-nitrides.The quantity density of individual inclusions increases radially from the center to the edge of the ingot,while decreasing axially from the top to the bottom,with the average size gradually decreasing in both radial and axial directions.Clustered inclusions were identified in the subsurface regions(2-10 mm in depth)and sidewall surfaces of the ingot.The formation mechanism and distribution characteristics of clustered inclusions during the VAR process were studied by combining in-situ high-temperature laser confocal microscopy observation and numerical analysis.In-situ observations confirm that larger inclusions lead to reduced critical aggregation distance,while smaller spacing enhances attraction and promotes cluster formation.The cavity bridge force between inclusions is significantly greater than the capillary force and van der Waals force,serving as the primary force responsible for the aggregation of inclusions.Numerical analysis reveals that inclusions within the VAR melt pool exhibit typical flow-following behavior and size effects,with their trajectory leading to preferential accumulation patterns along both the sidewall and subsurface regions,thereby facilitating cluster formation through particle agglomeration. 展开更多
关键词 Inclusion cluster Formation mechanism Aggregation behavior Ni-based superalloy Vacuum arc remelting
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Lattice misfit strain regulating kinetics and creep properties of multi-component Ni-based superalloy 认领 引用
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作者 Ye SHAN Sheng-long WANG +3 位作者 Hai-wei ZHANG Zan ZHANG Peng SANG Yong-sheng LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第7期2065-2079,共15页
A crystal plasticity theory was coupled with a phase-field model to investigate the regulating effect of initial lattice misfits on the kinetics evolution and creep properties of Ni-based superalloys.The quantitative ... A crystal plasticity theory was coupled with a phase-field model to investigate the regulating effect of initial lattice misfits on the kinetics evolution and creep properties of Ni-based superalloys.The quantitative characteristics of theγʹ-(Ni,Co)3(Al,Ta)phase,including morphology,particle size,element partitioning,rafting fracture,and plastic strain evolution,were systematically elucidated in a model Ni−12.2Al−6Co−2.5Ta(at.%)superalloy at 1273 K.The results reveal that reducing the initial lattice misfit between theγandγʹphases promotes the partitioning of Al and Ta into theγmatrix and Ni into theγʹphase,resulting in a higherγʹvolume fraction and slower coarsening rate in the alloys.Theγʹphase undergoes coalescence and coarsening at the primary creep stage,and dissolution and fracture at the secondary creep stage.Alloys with larger initial lattice misfit exhibit higher creep strain,faster raft degradation,and shorter creep life.These findings provide insights for designing high-performance superalloys by optimizing lattice misfits. 展开更多
关键词 Ni-based superalloy initial lattice misfit creep properties plasticity phase-field simulation
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