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Effects of silver loading and pretreatment with reaction gas on CO selective oxidation in H-2 over silver catalyst
Qu, ZP; Cheng, MJ; Shi, C; Bao, XH
关键词Silver Silica Supported Catalyst Hydrogen Carbon Monoxide Selective Oxidation
刊名CHINESE JOURNAL OF CATALYSIS
2002-09-01
23期:5页:460-464
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
关键词[WOS]CARBON-MONOXIDE ; CHEMISORBED OXYGEN ; SURFACE
英文摘要The removal of CO in H-2-rich gas by selective oxidation over Ag/SiO2 catalyst was investigated. The Ag loading and pretreatment with reaction gas at different temperatures had strong effects on the activity and selectivity of the catalyst for CO selective oxidation in H-2. The activiy of the catalyst increased with Ag loading, and the selectivity for CO oxidation decreased with reaction temperature. The temperature and the peak area of CO2 produced by CO-TPR were consistent with the reaction of CO selective oxidation in H-2. Moreover, the parabolic curves of the CO maximum conversion and its corresponding selectivity were obtained after the catalyst was treated with reaction gas at different temperatures. The highest CO conversion was obtained at 300 degreesC, and the selectivity at 200 degreesC. The surface structure of Ag particles may be changed during the process of treating the catalyst with H-2 at low temperature, which increased the activity and selectivity of the catalyst for CO oxidation. The facts that the larger Ag crystal particles were observed for the catalyst with higher Ag loading and the size of Ag particles decreased obviously after the sample was treated with reaction gas at high temperature (theta > 300 degreesC) indicated that the larger Ag particles under these conditions may favor CO selective oxidation at low temperature. Ag/SiO2 may be a promising catalyst for CO removal in the fuels for polymer-electrolyte type fuel cells at low temperature, and the activity and selectivity of the catalyst may be related with the size and the surface structure of Ag particles.
语种英语
WOS记录号WOS:000178634300018
引用统计
被引频次:14[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/139069
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China
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GB/T 7714
Qu, ZP,Cheng, MJ,Shi, C,et al. Effects of silver loading and pretreatment with reaction gas on CO selective oxidation in H-2 over silver catalyst[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(5):460-464.
APA Qu, ZP,Cheng, MJ,Shi, C,&Bao, XH.(2002).Effects of silver loading and pretreatment with reaction gas on CO selective oxidation in H-2 over silver catalyst.CHINESE JOURNAL OF CATALYSIS,23(5),460-464.
MLA Qu, ZP,et al."Effects of silver loading and pretreatment with reaction gas on CO selective oxidation in H-2 over silver catalyst".CHINESE JOURNAL OF CATALYSIS 23.5(2002):460-464.
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