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题名: Effect of basicity and adding CO2 in the feed on the oxidative coupling of methane over K2O and SrO promoted La2O3/ZnO catalysts
作者: Xu, YD;  Yu, L;  Guo, XX
关键词: oxidative coupling of methane ;  basicity ;  active oxygen species ;  KSLZ catalyst
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 1997-12-23
卷: 164, 期:1-2, 页:47-57
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: LZ and SLZ catalysts are fairly active for oxidative coupling of methane. Their catalytic performance can be further improved by adding K+ cations (supposedly in the form of K2O) as promoters. Under conventional reaction conditions such as a reaction temperature of 1073 K, methane conversion is 18.2% and C-2-selectivity is 68.3%. The effect of adding CO2 into the feed has also been examined in order to understand the promotional effect of K2O on the reaction. XRD, CO2-TPD and XPS techniques were used to characterize the basicity and possible active oxygen species of KSLZ catalysts. The functions of K2O in KSLZ catalyst can be attributed to its high dispersion, enrichment of surface basic sites and the ability to create active oxygen adspecies on the catalyst surface. Unfortunately, at the moment it is difficult to definitely identify the nature of the active oxygen adspecies. Meanwhile, it is found that with decreasing concentrations of SrO species on the catalyst surface, the catalyst will be less sensitive to the addition of CO2 in the feed. (C) 1997 Elsevier Science B.V.
关键词[WOS]: OXIDE CATALYSTS ;  SURFACE
语种: 英语
WOS记录号: WOS:000070990200005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142827
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, State Key Lab Catalysis, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Xu, YD,Yu, L,Guo, XX. Effect of basicity and adding CO2 in the feed on the oxidative coupling of methane over K2O and SrO promoted La2O3/ZnO catalysts[J]. APPLIED CATALYSIS A-GENERAL,1997,164(1-2):47-57.
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