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题名: Shape selectivity in methane dehydroaromatization over Mo/MCM-22 catalysts during a lifetime experiment
作者: Bai, J;  Liu, SL;  Xie, SJ;  Xu, LY;  Lin, LW
关键词: CH4 ;  dehydroaromatization ;  Mo/MCM-22 ;  coke formation ;  shape selectivity ;  specific surface area
刊名: CATALYSIS LETTERS
发表日期: 2003-10-01
卷: 90, 期:3-4, 页:123-130
收录类别: SCI
文章类型: Article
部门归属: 804
项目归属: 804
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Dehydroaromatization of CH4 with 2% CO2 on 6Mo/MCM-22 in a 100-h lifetime test was carried out at 993 K, atmospheric pressure and 1500 mL/gh. The duration of the lifetime test can be divided into an induction stage, stable stage and deactivation stage on the basis of the selectivities of hydrocarbons and coke. The characteristics of deposited coke with different time onstream were studied using TPO and TG techniques. There were two peaks corresponding to two kinds of coke recorded in TPO profiles, and the oxidation temperature of coke shifted to higher values with less hydrogen content with the increase of coke deposits. BET and Benzene-TPD techniques were employed to study the variation of specific surface area of the external and micropore surface versus time onstream. With the accumulation of coke deposits, although the pores became partially blocked and the internal surface decreased, methane could still enter the channel and was converted to benzene with shape selectivity until a critical value of coke deposition was reached.
关键词[WOS]: MO-BASED CATALYSTS ;  DEHYDRO-AROMATIZATION ;  CONVERSION ;  BENZENE ;  ZEOLITE ;  MO/HZSM-5 ;  DEHYDROGENATION ;  ACTIVATION ;  OXYGEN
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000186636600003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/83039
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:
Bai, J,Liu, SL,Xie, SJ,et al. Shape selectivity in methane dehydroaromatization over Mo/MCM-22 catalysts during a lifetime experiment[J]. CATALYSIS LETTERS,2003,90(3-4):123-130.
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