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题名: Effect of H-2 on adsorption and desorption behavior of CO over Rh-Mn-Li-Ti/SiO2 catalyst
作者: Chen, WM;  Ding, YJ;  Wang, T;  Jiang, DH;  Li, XM;  Luo, HY
关键词: infrared spectroscopy ;  temperature-programmed desorption ;  rhodium ;  manganese ;  lithium ;  titanium ;  silica ;  supported catalyst ;  hydrogen ;  carbon monoxide ;  adsorption ;  desorption
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2005-12-01
卷: 26, 期:12, 页:1099-1103
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 H-2 on the adsorption and desorption behavior of CO on the Rh-Mn-Li-Ti/SiO2 catalyst was examined by IR spectroscopy and temperature-programmed desorption. The results indicated that the pre-adsorbed H-2 mainly occupied the adsorption sites for linearly adsorbed CO, and the part of subsequently adsorbed CO reacted with adsorbed hydrogen producing carbonyl hydrides. In the mixture of CO and hydrogen, carbonyl hydrides were also formed on Rh sites causing the red shift of the IR band of linearly adsorbed CO, and the high hydrogen concentration enhanced the CO adsorption. At 323 K, the IR band position and intensity of pre-adsorbed CO were not sensitive to the hydrogen. However, with increasing temperature, the presence of hydrogen promoted the desorption of weakly adsorbed CO, and its re-adsorption, as well as the dissociation of strongly adsorbed CO. In addition, the existence of hydrogen intensified the CO adsorption and influenced the structure of Rh giving rise to the increase in Rh dispersion and thereby the amount of CO adsorbed on Rh at 323 K.
关键词[WOS]: SUPPORTED RHODIUM CATALYSTS ;  CARBON-MONOXIDE ;  HYDROGENATION ;  RH/SIO2 ;  INSITU ;  RH
语种: 英语
WOS记录号: WOS:000234620700013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139639
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, Liaoning, Peoples R China

Recommended Citation:
Chen, WM,Ding, YJ,Wang, T,et al. Effect of H-2 on adsorption and desorption behavior of CO over Rh-Mn-Li-Ti/SiO2 catalyst[J]. CHINESE JOURNAL OF CATALYSIS,2005,26(12):1099-1103.
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