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题名: Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H-2
作者: Guo, Yuanyuan1;  Chen, Limin1, 2;  Ma, Ding2, 3;  Ye, Daiqi1;  Huang, Bichun1
关键词: promotion effect ;  adsorbed water/OH ;  Ag/activated carbon (Ag/AC) catalysts ;  CO preferential oxidation (PROX)
刊名: JOURNAL OF ENERGY CHEMISTRY
发表日期: 2013-07-01
卷: 22, 期:4, 页:591-598
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 ;  Energy & Fuels ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Energy & Fuels ;  Engineering
英文摘要: Activated carbon (AC) supported silver catalysts were prepared by incipient wetness impregnation method and their catalytic performance for CO preferential oxidation (PROX) in excess H-2 was evaluated. Ag/AC catalysts, after reduction in H-2 at low temperatures (<= 200 degrees C) following heat treatment in He at 200 degrees C (He200H200), exhibited the best catalytic properties. Temperature-programmed desorption (TPD), X-ray diffraction (XRD) and temperature-programmed reduction (TPR) results indicated that silver oxides were produced during heat treatment in He at 200 degrees C which were reduced to metal silver nanoparticles in H-2 at low temperatures (<= 200 degrees C), simultaneously generating the adsorbed water/OH. CO conversion was enhanced 40% after water treatment following heat treatment in He at 600 degrees C. These results imply that the metal silver nanoparticles are the active species and the adsorbed water/OH has noticeable promotion effects on CO oxidation. However, the promotion effect is still limited compared to gold catalysts under the similar conditions, which may be the reason of low selectivity to CO oxidation in PROX over silver catalysts. The reported Ag/AC-S-He catalyst after He200H200 treatment displayed similar PROX of CO reaction properties to Ag/SiO2. This means that Ag/AC catalyst is also an efficient low-temperature CO oxidation catalyst.
关键词[WOS]: SELECTIVE OXIDATION ;  AG/SIO2 CATALYSTS ;  SILVER CATALYSTS ;  AG NANOPARTICLES ;  H-2-RICH GASES ;  ATOMIC OXYGEN ;  TEMPERATURE ;  HYDROGEN ;  AU(111) ;  SUPPORTS
语种: 英语
WOS记录号: WOS:000323239700007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137638
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.S China Univ Technol, Coll Environm Sci & Engn, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China
3.Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

Recommended Citation:
Guo, Yuanyuan,Chen, Limin,Ma, Ding,et al. Promotion effect of adsorbed water/OH on the catalytic performance of Ag/activated carbon catalysts for CO preferential oxidation in excess H-2[J]. JOURNAL OF ENERGY CHEMISTRY,2013,22(4):591-598.
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