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题名: Reduction of Pd/ZnO catalyst and its catalytic activity for steam reforming of methanol
作者: Wang Yanhua;  Zhang Jingchang;  Xu Hengyong;  Bai Xuefeng
关键词: palldium ;  zinc oxide ;  supported catalyst ;  steam reforming of methanol ;  PdZn alloy ;  active species ;  reduction
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2007-03-01
卷: 28, 期:3, 页:234-238
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The effect of reduction temperature of the coprecipitated 15.9 % Pd/ZnO catalyst on the catalytic activity for steam reforming of methanol was investigated. The results showed that methanol conversion at 523 K reached a maximum of 41.6 % with a CO2 selectivity of 94.6 % and an outlet CO concentration of 1.26 % over the catalyst reduced at 523-573 K. X-ray diffraction analysis revealed that a PdZn alloy began to form at a reduction temperature of 523 K. The improvement in activity at reduction temperature ranging from 523 to 573 K was attributed to the formation of the PdZn alloy with crystal size of 5-14 nm. The interaction between Pd and ZnO upon reduction was also explored by means of temperature-programmed reduction and X-ray diffraction. The results demonstrated that the reduction over Pd/ZnO might undergo a process PdO/ZnO -> Pd/ZnO -> PdZnO1-x/ZnO -> PdZn alloy/ZnO. The PdZn alloy was found to be partially oxidized to PdZnO1-x again during the reaction. The PdZn alloy and PdZnO1-x species might be the real active species.
关键词[WOS]: TEMPERATURE-PROGRAMMED REDUCTION ;  SUPPORTED PALLADIUM CATALYSTS ;  FUEL-CELLS ;  HYDROGEN ;  PERFORMANCE ;  COPPER
语种: 英语
WOS记录号: WOS:000245616800011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140487
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Heilongjiang Inst Petrochem, Harbin 150040, Heilongjiang, Peoples R China
2.Beijing Univ Chem Technol, Inst Modern Catalysis, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Wang Yanhua,Zhang Jingchang,Xu Hengyong,et al. Reduction of Pd/ZnO catalyst and its catalytic activity for steam reforming of methanol[J]. CHINESE JOURNAL OF CATALYSIS,2007,28(3):234-238.
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