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题名: Characterization of CO and/or NO Adsorbed on Reduced Rh-V/SiO2 Catalyst by Infraed Spectroscopy
作者: Li Xinsheng1;  Xin Qin1;  Zhang Hui1;  Li Jun2;  Zhou Jianlue2;  Chen Yaoqiang3;  Chen Yu3
关键词: CO and/or NO adsorption ;  IR spectoscopy ;  Rh-V/SiO2 catalyst
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 1994
DOI: 10.3866/PKU.WHXB19941109
卷: 10, 期:11, 页:1009-1014
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: In situ infrared spectroscopy has been used to study CO and/or NO adsorbed on reduced Rh/SiO2 and Rh-V/SiO2 catalysts. On Rh/SiO2 catalyst reduced at 573K, CO adsorption results in the formation of linear and bridged CO species as well as gem-dicarbonyl to give adsorption bands at 2060, 1867, 2085 and 2028cm(-1) respectively; NO adsorption bands appeared at 1726 and 1650cm(-1). However, on V/SiO2 catalyst reduced at 573K, no CO bands were observed, and two NO bands appeared at 1907 and 1810cm(-1). Furthermore, the NO bands shifted to 1890 and 1756cm(-1) when the V/SiO2 catalyst was reduced at 773K. Introduction of vanadium to the Rh/SiO2 catalyst showed a slight effect on the intensity of the gem-dicarbonyl shifted upwards by about 10cm(-1). These results indicate that the electron transfer from Rh-0 to vanadium ions was enhanced in Rh-V/SiO2 catalyst. Also promotion of reduction of V oxide by Rh was observed during the pretreatment of Rh-V/SiO2 catalyst as detected by ESR experiment. From the results of CO and NO coadsorption, it was found that the absorbed NO sepcies decreased CO adsorption on Rh, particularly, the linear CO species was completely disappeared. For the effects of NO adsorption on CO adsorption, there are two possibilities: (1) direct replacement of CO with NO; (2) oxidation of Rh-0 sites through NO dissociative adsorption. During the coadsorption, two possible intermediates, i.e., RhCONO and Rh(CO)(2)NO, were suggested for the surface process, which requires further investigation.
语种: 英语
WOS记录号: WOS:000207589800009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142750
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, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Sichuan Univ, Analyt & Testing Ctr, Chengdu 610064, Peoples R China
3.Sichuan Univ, Dept Chem, Chengdu 610064, Peoples R China

Recommended Citation:
Li Xinsheng,Xin Qin,Zhang Hui,et al. Characterization of CO and/or NO Adsorbed on Reduced Rh-V/SiO2 Catalyst by Infraed Spectroscopy[J]. ACTA PHYSICO-CHIMICA SINICA,1994,10(11):1009-1014.
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