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题名: A molecular insight into propylene epoxidation on Cu/SiO2 catalysts using O-2 as oxidant
作者: Su, Weiguang1;  Wang, Shouguo1;  Ying, Pinliang1;  Feng, Zhaochi1;  Li, Can1
关键词: C3H6 epoxidation ;  Cu/SiO2 ;  Propylene oxide ;  IR spectroscopy ;  Cu-0 or Cu+ species ;  Potassium acetate (KAc) modification
刊名: JOURNAL OF CATALYSIS
发表日期: 2009-11-15
DOI: 10.1016/j.jcat.2009.09.017
卷: 268, 期:1, 页:165-174
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: We investigated the catalytic performances of Cu/SiO2 with various promoters on the epoxidation of C3H6 by O-2. Propylene oxide (PO) is the only product at reaction temperatures below 500 K and the rate of PO formation can reach 2.5 mmol g(-1) h(-1) over the potassium acetate (KAc)-Cu/SiO2 Catalyst. IR studies show that both Cu-0 and Cu+ in Cu/SiO2 can activate the C=C bond Of C3H6, and pi donation of C3H6 to Cu-0 or Cu+ also results in a red shift of v(CO) with respect to CO adsorbed on Cu-0 or Cu+ "solo". However, C3H6 is only weakly adsorbed on Cu2+. Both Cu-0 and Cu+ species show C3H6 epoxidation activity. It is proposed that the isolated Cu species and small CuOx clusters with low valence state (Cu-0 or Cu+) modified by KAc are the main active sites for C3H6 epoxidation on Cu/SiO2 catalyst with O-2 as the oxidant. (C) 2009 Elsevier Inc. All rights reserved.
关键词[WOS]: VAPOR-PHASE EPOXIDATION ;  GOLD NANOPARTICLES ;  IR SPECTROSCOPY ;  HIGHER OLEFINS ;  NITROUS-OXIDE ;  PROPENE OXIDE ;  CU+ IONS ;  OXYGEN ;  HYDROGEN ;  COPPER
语种: 英语
WOS记录号: WOS:000272349000019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141309
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

Recommended Citation:
Su, Weiguang,Wang, Shouguo,Ying, Pinliang,et al. A molecular insight into propylene epoxidation on Cu/SiO2 catalysts using O-2 as oxidant[J]. JOURNAL OF CATALYSIS,2009,268(1):165-174.
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