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题名: Methane dehydro-aromatization over Co-modified Mo/MCM-22 catalysts in the absence of oxygen and coke deposition
作者: Tian, BL;  Liu, HM;  Su, LL;  Shu, YY;  Xu, YD
关键词: methane ;  aromatization ;  cobalt oxide ;  molybdenurn oxide ;  MCM-22 zeolite ;  coke
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2001-03-01
卷: 22, 期:2, 页:124-128
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
英文摘要: Mo/MCM-22 is a new type catalyst for methane dehydro-aromatization in the absence of oxygen, over which methane can be converted to aromatics with high benzene selectivity and catalytic stability. In this topic, we mainly discuss the promotional effect by the addition of Co to the Mo/MCM-22 catalyst as the second component. It suggests that different steeping methods have different affection to the catalyst. Coimpregnating Co and Mo ((Co, Mo)/MCM-22) results in better catalytic activity while first dipping with Mo and second with Co (Co-Mo/MCM-22) results in better catalytic stability with a Co/Mo atomic, ratio of 0.2. X-ray diffraction results indicate that the CoO and MoO3 can be highly distributed on the MCM-22 zeolite and their loadings weaken the zeolite's X-ray diffraction peak intensity. The coke that forms at low space velocity is mainly the graphitic type coke and that forms at high space velocity is mainly the pre-graphitic type one, which plays a key role to the catalytic deactivation. Thermogravimetric studies show that there is mainly two types of coke on the catalysts. The easy-burning coke is the main type coke which leads to the catalytic deactivation and the hard-burning coke has no effect on the catalytic deactivation. Hard-burning coke may be a heavy-hydrocarbon type coke that locates in the zeolite's large cages.
关键词[WOS]: SURFACE ;  BENZENE
语种: 英语
WOS记录号: WOS:000170359000007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138846
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, Key State Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Tian, BL,Liu, HM,Su, LL,et al. Methane dehydro-aromatization over Co-modified Mo/MCM-22 catalysts in the absence of oxygen and coke deposition[J]. CHINESE JOURNAL OF CATALYSIS,2001,22(2):124-128.
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