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题名: Carbon deposition and migration on Pt and Pt-Sn catalysts
作者: Xu, ZS;  Zhang, T;  Fang, YN;  Lin, LW;  Li, C;  Xin, Q
刊名: SPILLOVER AND MIGRATION OF SURFACE SPECIES ON CATALYSTS
发表日期: 1997
卷: 112, 页:425-432
收录类别: ISTP ;  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: Carbon deposition and migration, as well as their influence on the performances of Pt/Al2O3 and Pt-Sn/Al2O3 dehydrogenation catalysts, were investigated by catalytic reaction, hydrogen and ammonia chemisorption, NH3-TPD and TPO. The results showed that carbonaceous precursors first adsorbed at the active metal sites, and then migrated onto the acidic support surface. It was also found that the rate of carbon deposition on the Pt/Al2O3 was quicker than that on the Pt-Sn/Al2O3 at the initial period during butane dehydrogenation. The coking rate on the Pt catalyst increased slowly with continual reaction, while that on the Pt-Sn catalyst increased linearly, and finally overtook the Pt catalyst. However, the amount of carbonaceous material migrated from the metal to the support was larger on the Pt-Sn catalyst than on the Pt catalyst. For the same amount of carbon deposition, e.g. 8wt%, on the catalyst surface, 50% of the metal surface on the Pt-Sn catalyst remained uncovered, whereas only 25% of the metal surface of the platinum catalyst was bare. Hence, addition of tin into the Pt/Al2O3 catalyst could increase its catalytic activity and stability for paraffin dehydrogenation.
关键词[WOS]: PT/AL2O3 ;  COKE
语种: 英语
WOS记录号: WOS:000071952700047
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142808
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

Recommended Citation:
Xu, ZS,Zhang, T,Fang, YN,et al. Carbon deposition and migration on Pt and Pt-Sn catalysts[J]. SPILLOVER AND MIGRATION OF SURFACE SPECIES ON CATALYSTS,1997,112:425-432.
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