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题名: Direct gas-phase epoxidation of propylene to propylene oxide using air as oxidant on supported gold catalyst
作者: Suo, Zhanghuai1;  Jin, Mingshan1;  Lu, Jiqing2;  Wei, Zhaobin2;  Li, Can2
通讯作者: Zhanghuai Suo
关键词: gold catalyst ;  support ;  modified impregnation method ;  epoxidation of propylene ;  molecular oxygen
刊名: JOURNAL OF NATURAL GAS CHEMISTRY
发表日期: 2008-06-01
卷: 17, 期:2, 页:184-190
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 503
产权排名: 2;3
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: Gold catalysts supported on SiO(2), TiO(2), TiO(2)-SiO(2), and ZrO(2)-SiO(2) supports were prepared by impregnating each support with a basic solution of tetrachloroauric acid. X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) techniques were used to characterize their structure and surface composition. The results indicated that the size of gold particles could be controlled to below 10 nm by this method of preparation. Washing gold catalysts with water could markedly enhance the dispersion of metallic gold particles on the surface, but it could not completely remove the chloride ions left on the surface. The catalytic performance of direct vapor-phase epoxidation of propylene using air as an oxidant over these catalysts was evaluated at atmospheric pressure. The selectivity to propylene oxide (PO) was found to vary with reaction time on the stream. At the reaction conditions of atmosphere pressure, temperature 325 degrees C, feed gas ratio V(C(3)H(6))/V(O(2)) = 1/2, and GHSV = 6000 h(-1), 17.9% PO selectivity with 0.9% propylene conversion were obtained at initial 10 min for Au/SiO(2) catalyst. After reacting 60 min only 8.9% PO selectivity were detected, but the propylene conversion rises to 1.4% and the main product is transferred to acrolein (72% selectivity). Washing Au/TiO(2)-SiO(2) and Au/ZrP(2)-SiO(2) samples with magnesium citrate solution could markedly enhance the activity and PO selectivity because smaller gold particles were obtained.
关键词[WOS]: AU CATALYSTS ;  MOLECULAR-OXYGEN ;  INCIPIENT WETNESS ;  OXIDATION ;  IMPREGNATION ;  PROPENE ;  ETHYLENE ;  O-2 ;  H-2 ;  TS-1
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000257686500014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/101261
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.Yantai Univ, Inst Appl Catalysis, Yantai 264005, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Suo, Zhanghuai,Jin, Mingshan,Lu, Jiqing,et al. Direct gas-phase epoxidation of propylene to propylene oxide using air as oxidant on supported gold catalyst[J]. JOURNAL OF NATURAL GAS CHEMISTRY,2008,17(2):184-190.
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