期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到75篇文章
< 1 2 … 4 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Effect of active metal oxide dopants on wettability and interfacial reaction between K417G superalloy and Al2O3-based ceramic shell 认领 引用
1
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
暂未订购 下载PDF
Developing sodium-doped ceria-based electrolytes for low-temperature solid oxide fuel cells 认领 引用
2
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
暂未订购 下载PDF
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
3
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
暂未订购 下载PDF
A rationale for the development of thermally stable nanostructured CeO_2-ZrO_2-containing mixed oxides 认领 引用 被引量：10
4
作者 Roberta Di Monte Jan Kapar +1 位作者 Heather Bradshaw Colin Norman 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期136-140,共5页
CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for... CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for practical application since temperatures up to 1273 K are easily experienced by these materials under real working conditions. In the present paper, we investigated how hydrothermal treatments applied to cakes of doped and undoped ZrO2-rich CeO2-ZrO2 precursors might improve the thermal stability of the final CeO2-ZrO2 solid solution. A rationale was developed that allowed to correlate the morphology of the hydrothermaUy treated cake with the thermal stability at 1273 K of the final product, which did not depend on the composition of the mixed oxides. 展开更多
关键词 CeO2-ZrO2 mixed oxides CeO2-ZrO2 solid solution CeO2-ZrO2 mixed oxides, thermal stability of three-way catalysts oxygen storage capacity rare earths
暂未订购 下载PDF
Catalytic reduction of SO_2 by CO over CeO_2-TiO_2 mixed oxides 认领 引用 被引量：8
5
作者 张丽 秦毅红 +3 位作者 陈白珍 彭亚光 何汉兵 袁依 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2960-2965,共6页
The structure and catalytic desulfurization characteristics of CeO2-TiO2 mixed oxides were investigated by means ofX-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and catalytic activity tests. Acco... The structure and catalytic desulfurization characteristics of CeO2-TiO2 mixed oxides were investigated by means ofX-ray diffraction （XRD）, X-ray photoelectron spectroscopy （XPS） and catalytic activity tests. According to the results, a CeO2-TiO2solid solution is formed when the mole ratio of cerium to titanium n（Ce）：n（Ti） is 5：5 or greater, and the most suitable n（Ce）：n（Ti） isdetermined as 7：3, over which the conversion rate of SO2 and the yield of sulfur at 500℃ reach 93% and 99%, respectively.According to the activity testing curve, Ce0.7Ti0.3O2 （n（Ce）：n（Ti）=7：3） without any pretreatment can be gradually activated by reagentgas after about 10 min, and reaches a steady activation status 60 min later. The XPS results of Ce0.7Ti0.3O2 after different time ofSO2＋CO reaction show that CeO2 is the active component that offers the redox couple Ce4＋/Ce3＋ and the labile oxygen vacancies, andTiO2 only functions as a catalyst structure stabilizer during the catalytic reaction process. After 48 h of catalytic reaction at 500℃,Ce0.7Ti0.3O2 still maintains a stable structure without being vulcanized, demonstrating its good anti-sulfur poisoning performance. 展开更多
关键词 CeO2-TiO2 mixed oxides solid solution catalytic reduction carbon monoxide sulfur dioxide
暂未订购 下载PDF
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
6
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
暂未订购 下载PDF
A review of Al2O3-based eutectic ceramics for high-temperature structural materials 认领 引用 被引量：2
7
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
暂未订购 下载PDF
SnO_2-based solid solutions for CH_4 deep oxidation: Quantifying the lattice capacity of SnO_2 using an X-ray diffraction extrapolation method 认领 引用 被引量：1
8
作者 孙琪 徐香兰 +5 位作者 彭洪根 方修忠 刘文明 应家伟 余帆 王翔 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第8期1293-1302,共10页
A series of SnO2‐based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M （M=Mn, Zr, Ti and Pb） molar ratio of 9/1 were prepared by a co‐precipitation method and used for CH4 and CO oxidation. The Mn3＋, ... A series of SnO2‐based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M （M=Mn, Zr, Ti and Pb） molar ratio of 9/1 were prepared by a co‐precipitation method and used for CH4 and CO oxidation. The Mn3＋, Zr4＋, Ti4＋and Pb4＋cations are incorporated into the lattice of tetragonal rutile SnO2 to form a solid solution structure. As a consequence, the surface area and thermal stability of the catalysts are improved. Moreover, the oxygen species of the modified catalysts become easier to be reduced. Therefore, the oxidation activity over the catalysts was improved, except for the one modified by Pb oxide. Manganese oxide demonstrates the best promotional effects for SnO2. Using an X‐ray diffraction extrapolation method, the lattice capacity of SnO2 for Mn2O3 was 0.135 g Mn2O3/g SnO2, which indicates that to form stable solid solution, only 21%Sn4＋cations in the lattice can be maximally replaced by Mn3＋. If the amount of Mn3＋cations is over the capacity, Mn2O3 will be formed, which is not favorable for the activity of the catalysts. The Sn rich samples with only Sn‐Mn solid solution phase show higher activity than the ones with excess Mn2O3 species. 展开更多
关键词 SnO2-based solid solution X-ray diffraction extrapolation method Lattice capacity Methane deep oxidation Carbon monoxide oxidation
暂未订购 下载PDF
IN situ Confocal Microprobe Raman Spectroscopic Studies on Defective La-based Complex Oxides 认领 引用
9
作者 CHEN Du-hui, CAI Jun-xiu , LIAO Yuan-yian , WAN Hui-lin 《Chemical Research in Chinese Universities》 SCIE EI CAS 1997年第3期249-255,共7页
The adsorption of O2 over defective La2O3-based OCM catalysts with anionic vacancies , and the reaction of surface oxygen species with CH4 were studied by means of in situ confocal microprobe Raman spectra. The partia... The adsorption of O2 over defective La2O3-based OCM catalysts with anionic vacancies , and the reaction of surface oxygen species with CH4 were studied by means of in situ confocal microprobe Raman spectra. The partially reduced oxygen species O2, O , O (O<&<1 ) and even the lattice oxygen ion O2-can be detected on the surface of O2-pretreated La2O3-based catalysts. At lower temperatures (< 573 K) it is peroxide species O- or O- that is more essential for the coupling of methane,while at higher temperature. the superoxide O2 and lattice oxygen species O2-are rather important. It is easier for fluoride-containing La2O3-based catalysts to induce the oxygen species with fewer negative charges and the basicity of the cat- alyst surface is weakened , so that the C2 selectivity for OCM reaction is improved. 展开更多
关键词 Methane oxidative coupling Oxygen adspecies Defective La2O3-based
暂未订购 下载PDF
Support interaction of Pt/CeO2 and Pt/SiC catalysts prepared by nano platinum colloid deposition for CO oxidation 认领 引用 被引量：9
10
作者 Kang Xi Yong Wang +3 位作者 Kang Jiang Jing Xie Ying Zhou Hanfeng Lu 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第4期376-383,共8页
The interaction between Pt and its various supports can regulate the intrinsic electronic structure of Pt particles and their catalytic performance.Herein,Pt/CeO2 and Pt/SiC catalysts were successfully prepared via a ... The interaction between Pt and its various supports can regulate the intrinsic electronic structure of Pt particles and their catalytic performance.Herein,Pt/CeO2 and Pt/SiC catalysts were successfully prepared via a facile Pt colloidal particle deposition method,and their catalytic performance in CO oxidation was investigated.XRD,TEM,XPS and H2-TPR were used to identify the states of Pt particles on the support surface,as well as their effect on the performance of the catalysts.Formation of the Pt-O-Ce interaction is one of the factors controlling catalyst activity.Under the oxidative treatment at low temperature,the Pt-O-Ce interaction plays an important role in improving the catalytic activity.After calcining at high temperature,enhanced Pt-O-Ce interaction results in the absence of metallic Pt0 on the support surface,as evidenced by the appearance of Pt2+species.It is consistent with the XPS data of Pt/CeO2,and is the main reason behind the deactivation of the catalyst.By contrast,either no interaction is formed between Pt and SiC or Pt nanoparticles remain in the metallic Pt0 state on the SiC surface even after aging at 800℃in an oxidizing atmosphere.Thus,the Pt/SiC shows better thermal stability than Pt/CeO2.The interaction between Pt and the active support may be concluded to be essential for CO oxidation at low temperature,but strong interactions may induce serious deactivation of catalytic activity. 展开更多
关键词 Nano platinum colloid CO oxidation Pt-O-Ce interaction CeO2 SiC Rare earths
暂未订购 下载PDF
Effect of water vapor on the CO and CH_4 catalytic oxidation over CeO_2-MO_x (M=Cu, Mn, Fe, Co, and Ni) mixed oxide 认领 引用 被引量：14
11
作者 乔东升 卢冠忠 +2 位作者 郭耘 王艳芹 郭杨龙 《Journal of Rare Earths》 SCIE EI CAS 2010年第5期742-746,共5页
CeO2-MOx (M=Cu, Mn, Fe, Co, and Ni) mixed oxide catalysts were prepared by a citric acid complexation-combustion method. CeO2-MOx solid solutions could be formed with M cations doping into CeO2 lattice, while NiO and ... CeO2-MOx (M=Cu, Mn, Fe, Co, and Ni) mixed oxide catalysts were prepared by a citric acid complexation-combustion method. CeO2-MOx solid solutions could be formed with M cations doping into CeO2 lattice, while NiO and Co3O4 phases were detected on the surface of CeO2-NiO and CeO2-Co3O4 by Raman spectroscopy. The presence of M in CeO2 could obviously promote its catalytic activity for CH4 catalytic combustion and CO oxidation. Among the prepared samples, CeO2-CuO exhibited the best performance for CO oxidatio... 展开更多
关键词 CeO2-MOx solid solution catalytic oxidation methane combustion CO oxidation effect of water vapor rare earths
暂未订购 下载PDF
Effect of CeO2-ZrO2 on Pt/C electrocatalysts for alcohols oxidation 认领 引用 被引量：7
12
作者 王青春 刘振朋 +3 位作者 安胜利 王瑞芬 王艳玲 徐拓 《Journal of Rare Earths》 SCIE EI CAS CSCD 2016年第3期276-282,共7页
The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized b... The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The electrochemical properties were measured by a three electrode system on electrochemical workstation（IVIUM）. The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C（M=Ce, Zr） for methanol and ethanol oxidation was better than that of Pt-CeO_2/C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity（OSC）. Furthermore, the best performance was found when the molar ratio of CeO_2 to ZrO_2 was 2：1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C（M=Ce, Zr, Ce：Zr=2：1） towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2/C. Pt-MO_x/C（M=Ce, Zr） appeared to be a promising and less expensive methanol oxidation anode catalyst. 展开更多
关键词 CeO2-ZrO2 composite oxide catalyst preparation characterization performance rare earths
暂未订购 下载PDF
Preparation, Characterization of CuO/CeO_2 and Cu/CeO_2 Catalysts and Their Applications in Low-Temperature CO Oxidation 认领 引用 被引量：9
13
作者 郑修成 韩东战 +4 位作者 王淑萍 张守民 王淑荣 黄唯平 吴世华 《Journal of Rare Earths》 SCIE EI CAS 2005年第1期47-51,共5页
CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were ... CeO2 was synthesized via sol-gel process and used as supporter to prepare CuO/CeO2, Cu/CeO2 catalysts by impregnation method. The catalytic properties and characterization of CeO2, CuO/CeO2 and Cu/CeO2 catalysts were examined by means of a microreactor-GC system, HRTEM, XRD, TPR and XPS techniques. The results show that CuO has not catalytic activity and the activity of CeO2 is quite low for CO oxidation. However, the catalytic activity of CuO/CeO2 and Cu/ CeO2 catalysts increases significantly. Furthermore, the activity of CuO/CeO2 is higher than that of Cu/CeO2 catalysts. 展开更多
关键词 catalytic chemistry CuO/CeO2 catalysts Cu/CeO2 catalysts carbon monoxide oxidation rare earths
暂未订购 下载PDF
Enhanced CO oxidation activity of CuO/CeO_2 catalyst prepared by surfactant-assisted impregnation method 认领 引用 被引量：19
14
作者 孙帅帅 毛东森 俞俊 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第12期1268-1274,共7页
A modified CuO/CeO2 catalyst was prepared by surfactant-assisted impregnation method and showed better catalytic activity for low temperature CO oxidation than that from conventional impregnation method. The physicoch... A modified CuO/CeO2 catalyst was prepared by surfactant-assisted impregnation method and showed better catalytic activity for low temperature CO oxidation than that from conventional impregnation method. The physicochemical properties of different CuO/CeO2 catalysts were characterized by thermogravimetrie and differential scanning calorimetric measurements （TG-DSC）, X-ray diffraction （XRD）, N2 adsorpti0n-desorption, Raman spectroscopy, H2 temperature-programmed reduction （H2-TPR）, tern- perature-programmed desorption of 02 （O2-TPD）, and diffuse reflectance infrared Fourier transform spectroscopy （DRIFTS）. The re- sults suggested that the addition of hexadecyl trimethyl ammonium bromide （CTAB） into the impregnation solution could improve the dispersion of CuO species, which could facilitate Cu2＋ incorporating into CeO2 lattice and strengthened the synergistic effects between CuO and CeO2, making the lattice oxygen more active, and eventually resulting in enhanced activity for CO oxidation. 展开更多
关键词 surfactant-assisted impregnation CuO/CeO2 CTAB CO oxidation rare earths
暂未订购 下载PDF
Preparation of Au/CeO_2 catalyst and its catalytic performance for HCHO oxidation 认领 引用 被引量：8
15
作者 贾美林 白海锋 +2 位作者 照日格图 沈岳年 李彦锋 《Journal of Rare Earths》 SCIE EI CAS 2008年第4期528-531,共4页
Aqueous precipitation and deposition-precipitation method were used to prepare CeO2 supports and Au/CeO2 catalysts, respectively. The effect of preparation condition of support on the catalyst activity was investigate... Aqueous precipitation and deposition-precipitation method were used to prepare CeO2 supports and Au/CeO2 catalysts, respectively. The effect of preparation condition of support on the catalyst activity was investigated. The catalytic combustion of HCHO was considered as the probe reaction for comparing the catalyst activity. The BET, X-ray diffraction, X-ray photoelectron spectroscopy （XPS）, and reduction （TPR） were carried out to analyze the influence factor on the catalysts activity. The results showed that the addition of dispersant and use of microwave in the support preparation procedure could be beneficial for enhancing the interaction of supports and gold species and thus improved the catalytic activity. The total conversion temperature for HCHO was 146 ℃ over AC400. With the modification during supports preparation process, the catalytic activity increased with total conversion temperature decreasing to 98 ℃. The results of XPS indicated that Au^0 and Au^＋1 species coexisted in these catalysts and the activity of catalyst correlated with Au^＋1/Au^0 ratio. Temperature-programmed reduction results demonstrated that the reduction peak appeared between 100-170 ℃ with the inducing of gold. The dependence of activity on the reduction peak temperature implied that ionic gold was catalytic activity component for HCHO oxidation. 展开更多
关键词 gold catalyst deposition precipitation CeO2 catalytic oxidation of HCHO rare earths
暂未订购 下载PDF
CeO_2-supported vanadium oxide catalysts for soot oxidation:the roles of molecular structure and nanometer effect 认领 引用 被引量：6
16
作者 刘坚 赵震 +2 位作者 徐春明 段爱军 姜桂元 《Journal of Rare Earths》 SCIE EI CAS 2010年第2期198-204,共7页
The nanometer CeO2 powder was prepared by the method of microwave-assisted heating hydrolysis,and the nanometer CeO2-supported or ordinary CeO2-supported vanadia catalysts with different vanadium loadings(atomic ratio... The nanometer CeO2 powder was prepared by the method of microwave-assisted heating hydrolysis,and the nanometer CeO2-supported or ordinary CeO2-supported vanadia catalysts with different vanadium loadings(atomic ratios:100V/Ce=0.1,1,4,10,and 20) were prepared by an incipient-wetness impregnation method.Spectroscopic techniques(XRD,FT-IR,Raman and UV-Vis DRS) were utilized to characterize the structures of VOx/CeO2 catalysts.The results showed that the structures of CeO2-supported vanadium oxide catalysts de... 展开更多
关键词 vanadium oxide catalyst CeO2 nanometer soot combustion rare earths
暂未订购 下载PDF
CuO-CeO_2/Al_2O_3/FeCrAl monolithic catalysts prepared by in situ combustion synthesis method for preferential oxidation of carbon monoxide 认领 引用 被引量：5
17
作者 曾尚红 苏海全 +2 位作者 刘源 王岩 王东方 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第1期69-73,共5页
This work described in situ combustion synthesis method for depositing CuO-CeO2 on the FeCrAI honeycomb supports. The influence of the solution concentration and the role of the additive were studied and analyzed by s... This work described in situ combustion synthesis method for depositing CuO-CeO2 on the FeCrAI honeycomb supports. The influence of the solution concentration and the role of the additive were studied and analyzed by scanning electron microscopy （SEM）, X-ray diffractometer （XRD）, and temperature programmed reduction （TPR） techniques. The results showed that 200 g/L of the active solution was the most appropriate concentration for preparing the monolithic catalysts, and the additives of praseodymium and lanthanum improved the adhesion stability of the monolithic catalysts. The addition of Pr did not greatly affect the catalytic performance, but CO could not be totally converted into CO2 after the addition of La into the CuO-CeO2/Al2O3/FeCrAl catalysts. 展开更多
关键词 monolith CuO CeO2 FeCrAl combustion hydrogen preferential oxidation rare earths
暂未订购 下载PDF
High activity of CeO2-TiO2 composites for deep oxidation of 1,2-dichloroethane 认领 引用 被引量：10
18
作者 Jialu Wang Zhinan Shi Renxian Zhou 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第8期906-911,I0003,共6页
CeO2-TiO2 catalysts prepared by different methods were investigated for deep oxidation of 1,2-dichloroethane(DCE),as a typical representative of the chlorinated volatile organic compounds(CVOCs).Characterization analy... CeO2-TiO2 catalysts prepared by different methods were investigated for deep oxidation of 1,2-dichloroethane(DCE),as a typical representative of the chlorinated volatile organic compounds(CVOCs).Characterization analysis reveals that CeO2-TiO2 catalysts prepared by sol-gel and coprecipitation methods exhibit higher specific area,CeO2 and TiO2 particles are highly dispersed into each other and the reducibility and mobility of active oxygen species are obviously promoted due to the strong interaction between the two catalysts CeO2 and TiO2,resulting in higher catalytic activity for DCE oxidation to and less chlorinated byproduct.The high calcination temperature would lead to the formation of a new monoclinic phase Ce0.3Ti0.7O2 and sintering,which is the main reason for the catalytic activity for DCE oxidation markedly decreases. 展开更多
关键词 CeO2-TiO2 catalysts Synergism Chlorinated VOCs Catalytic oxidation Rare earths
暂未订购 下载PDF
Enhanced ethanol electro-oxidation on CeO_2-modified Pt/Ni catalysts in alkaline solution 认领 引用 被引量：5
19
作者 徐志花 饶丽霞 +3 位作者 宋海燕 严朝雄 张利君 杨水彬 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第2期305-312,共8页
Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts ... Pt/Ni catalysts modified with CeO2 nanoparticles were prepared by simple composite electrodeposition of Ni and CeO2,and spontaneous Ni partial replacement by Pt processes.The as-prepared CeO2-modified Pt/Ni catalysts showed enhanced catalytic performance for ethanol electro-oxidation compared with pure Pt/Ni,and acetate species were proposed to be the main products of the oxidation when using these catalysts.The content of CeO2 in the as-prepared catalysts influenced their catalytic activity,with Pt/NiCe2（obtained from an electrolyte containing 100 mg/L CeO2 nanoparticles） exhibiting higher activity and relatively better stability in ethanol electro-oxidation.This was mainly due to the oxygen storage capacity of CeO2,the interaction between Pt and CeO2/Ni,and the relatively small contact and charge transfer resistances.The results of this work thus suggest that electrocatalysts with low price and high activity can be rationally designed and produced by a simple route for use in direct ethanol fuel cells. 展开更多
关键词 Direct ethanol fuel cell Ethanol oxidation CeO2 nanoparticle Composite electrodeposition Electrocatalyst
暂未订购 下载PDF
Catalytic Partial Oxidation of Methane over Ni/CeO_2-ZrO_2-Al_2O_3 认领 引用 被引量：10
20
作者 梅大江 陈耀强 +3 位作者 钟俊波 魏振玲 马迪 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第3期311-315,共5页
Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron sp... Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron spectroscopy（XPS）.Through the test of catalytic partial oxidation of methane（CPOM）,Ni/CeO2-ZrO2-Al2O3 displayed the highest activity,which resulted from its largest BET area and best NiO dispersion.Furthermore,Ni/CeO2-ZrO2-Al2O3 maintained a long-time stability in CPOM,which was attributed to its best coking resistance among all the prepared catalysts. 展开更多
关键词 Ni/CeO2-ZrO2-Al2O3 catalyst catalytic partial oxidation of methane carbon deposition rare earths
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 4 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈