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题名: Effect of metal-support interaction on coking resistance of Rh-based catalysts in CH4/CO2 reforming
作者: Wang Rui;  Liu Xuebin;  Chen Yanxin;  Li Wenzhao;  Xu Hengyong
关键词: methane ;  carbon dioxide reforming ;  rhodium ;  metal-support interaction ;  oxygen vacancy ;  temperature-programmed oxidation
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2007-10-01
卷: 28, 期:10, 页:865-869
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 effects of metal-support interaction on coking resistance of Rh/Al2O3, Rh/SiO2, and Rh/CeO2 catalysts during CH4/CO2 reforming were investigated. Temperature-programmed reduction and temperature-programmed oxidation (TPO) over fresh and used catalysts suggested that for Rh/Al2O3 and Rh/SiO2, the strong interaction between the metal and support led to a high dispersion of Rh after reduction. The CH, species formed on well-dispersed Rh with small Rh crystals could act as active intermediates to react with CO2 to form CO and H-2 . On the other hand, the carbon species formed on isolated Rh with large Rh crystals had a relatively low reactivity with CO2, which was attributed to the deactivation of catalysts. For the Rh/CeO2 catalyst, TPO and CO2 pulse experiment results indicated that the CH, species formed were more reactive than those formed on Rh/Al2O3 and Rh/SiO2. The unique Rh-CeO2 interaction resulted in the creation of CeO2-x and oxygen vacancies after partial reduction of CeO2, which facilitated the CO2 dissociation. As a result, the dissociated surface oxygen could readily react with CH, species, thereby inhibiting the carbon deposition over Rh/CeO2.
关键词[WOS]: CARBON-DIOXIDE ;  SYNTHESIS GAS ;  RHODIUM CATALYSTS ;  METHANE ;  CO2 ;  DEACTIVATION ;  OXIDATION ;  PATHWAYS ;  OXIDE ;  CH4
语种: 英语
WOS记录号: WOS:000250972600006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140638
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.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ Beijing, Beijing 100049, Peoples R China

Recommended Citation:
Wang Rui,Liu Xuebin,Chen Yanxin,et al. Effect of metal-support interaction on coking resistance of Rh-based catalysts in CH4/CO2 reforming[J]. CHINESE JOURNAL OF CATALYSIS,2007,28(10):865-869.
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