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| Pt/Ce0.75Zr0.25O2的催化性能及其氧移动性的 18O 同位素交换表征 | |
| 引用本文： | 林瑞,孙公权,辛勤.Pt/Ce0.75Zr0.25O2的催化性能及其氧移动性的 18O 同位素交换表征[J].催化学报,2006,27(2):109-114. |
| 作者姓名： | 林瑞 孙公权 辛勤 |
| 作者单位： | 1. 西班牙最高科研理事会,催化与石油化学研究所,马德里,28049;西班牙中国科学院大连化学物理研究所直接醇类燃料电池实验室,催化基础国家重点实验室,辽宁大连,116023;同济大学嘉定校区汽车学院氢能技术研究所,上海,201804 2. 西班牙最高科研理事会, 催化与石油化学研究所, 马德里 28049, 西班牙 3. 西班牙国家远程教育大学理学院无机化学与技术系, 马德里 28040, 西班牙 4. 中国科学院大连化学物理研究所直接醇类燃料电池实验室,催化基础国家重点实验室,辽宁大连,116023 |
| 基金项目： | 西班牙政府国际合作项目;中国科学院资助项目;浙江省自然科学基金 |
| 摘 要： | 采用浸渍法制备了Pt/Ce0.75Zr0.25O2催化剂,考察了催化剂对乙醇及CO的氧化活性,并采用 18O 同位素交换、乙醇程序升温表面反应(C2H5OH-TPSR)、一氧化碳程序升温脱附(CO-TPD)和程序升温还原(H2-TPR)等技术对催化剂进行了表征. 结果表明, Pt/Ce0.75Zr0.25O2催化剂表现出较高的乙醇和CO氧化活性,其催化活性随着Pt负载量的增加而提高. 当Pt负载量为3%时,活性最高. 继续增加Pt负载量,催化剂活性下降. C2H5OH-TPSR和CO-TPD结果表明,催化剂对乙醇或CO的氧化活性与从催化剂表面脱附出来的CO2量有对应关系, CO2脱附量越大,催化剂活性越高. 18O 同位素交换结果表明,表面氧交换能力与其氧化活性有一定对应关系,催化剂的表面氧交换能力越高,氧化活性越高. |
| 关 键 词： | 铂 氧化铈 氧化锆 乙醇 一氧化碳 氧化 氧 同位素交换 程序升温脱附 程序升温表面反应 |
| 文章编号： | 0253-9837（2006）02-0109-06 |
| 收稿时间： | 07 5 2005 12:00AM |
| 修稿时间： | 2005-07-05 |
Catalytic Activity and Characterization of Oxygen Mobility on Pt/Ce0.75Zr0.25O2 Catalyst by Isotopic Exchange with 18O |
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| LIN Rui,Rodríguez-Ramos INMACULADA,Bachiller-Baeza BELEN,Guerrero-Ruiz ANTONIO,SUN Gongquan,XIN Qin.Catalytic Activity and Characterization of Oxygen Mobility on Pt/Ce0.75Zr0.25O2 Catalyst by Isotopic Exchange with 18O[J].Chinese Journal of Catalysis,2006,27(2):109-114. | |
| Authors: | LIN Rui Rodríguez-Ramos INMACULADA Bachiller-Baeza BELEN Guerrero-Ruiz ANTONIO SUN Gongquan XIN Qin |
| Institution: | 1 Institute of Catalysis and Petrochemistry, Spanish Council for Scientific Research, Madrid 28049, Spain ; 2 Direct Alcohol Fuel Cell Laboratory, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics The Chinese Academy of Sciences, Dalian 116023, Liaoning, China ; 3 Institute for Hydrogen Technologies, School of Automotive Studies, Tongji University (Jiading Campus |
| Abstract: | The Ce_(0.75)Zr_(0.25)O_2-supported Pt catalysts with different Pt loadings were prepared by the impregnation method.The results of isotopic exchange of(()~(18)O),temperature-programmed surface reaction of ethanol(C_2H_5OH-TPSR),temperature-programmed desorption of CO(CO-TPD),and temperature-programmed reduction of H_2(H_2-TPR) show that the Pt phase is amorphous and well dispersed on the support surface.The C_2H_5OH-TPSR and CO-TPD results show a good correlation of the amount of desorbed CO_2 with the catalytic activity for ethanol or CO oxidation.The Pt/Ce_(0.75)Zr_(0.25)O_2 catalyst has improved activity for ethanol or CO oxidation,and the catalytic activity is related to the Pt loading.The results of the ethanol or CO oxidation and isotopic exchange of(()~(18)O) show that the oxygen exchange capacity is responsible for the improved catalytic activity.The sample with the best catalytic activity has the highest surface oxygen diffusion rate. |
| Keywords: | platinum cerium oxide zirconium oxide ethanol carbon monoxide oxidation oxygen isotopic exchange temperature-programmed desorption temperature-programmed surface reaction |
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