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题名: Study on chemisorption of H-2, O-2, CO and C2H4 on Pt-Ag/SiO2 catalysts by microcalorimetry and FTIR
作者: Li, L;  Wang, X;  Shen, J;  Zhou, L;  Zhang, T
关键词: chemisorption ;  differential heat ;  microcalorimetry ;  Pt-Ag/SiO2
刊名: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
发表日期: 2005
DOI: 10.1007/s10973-005-6852-z
卷: 82, 期:1, 页:103-107
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Adsorption microcalorimetry has been employed to study the interaction of ethylene with the reduced and oxidized Pt-Ag/SiO2 Catalysts with different Ag contents to elucidate the modified effect of Ag towards the hydrocarbon processing on platinum catalysts. In addition, microcalorimetric adsorption of H-2, O-2, CO and FTIR of CO adsorption were conducted to investigate the influence of Ag on the surface structure of Pt catalyst. It is found from the microcalorimetric results of H-2 and O-2 adsorption that the addition of Ag to Pt/SiO2 leads to the enrichment of Ag on the catalyst surface which decreases the size of Pt surface ensembles of Pt-Ag/SiO2 catalysts. The microcalorimetry and FTIR of CO adsorption indicates that there still exist sites for linear and bridged CO adsorption on the surface of platinum catalysts simultaneously although Ag was incorporated into Pt/SiO2. The ethylene microcalorimetric results show that the decrease of ensemble size of Pt surface sites suppresses the formation of dissociative species (ethylidyne) upon the chemsorption of C2H4 on Pt-Ag/SiO2. The differential heat vs. uptake plots for C2H4 adsorption on the oxygen-preadsorbed Pt/SiO2 and Pt-Ag/SiO2 catalysts suggest that the incorporation of Ag to Pt/SiO2 could decrease the ability for the oxidation of C2H4.
关键词[WOS]: ETHYLENE ADSORPTION ;  HYDROCARBONS ;  PT/SIO2
语种: 英语
WOS记录号: WOS:000233245600015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139816
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.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
3.Nanjing Univ, Dept Chem, Nanjing 210093, Peoples R China

Recommended Citation:
Li, L,Wang, X,Shen, J,et al. Study on chemisorption of H-2, O-2, CO and C2H4 on Pt-Ag/SiO2 catalysts by microcalorimetry and FTIR[J]. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY,2005,82(1):103-107.
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