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题名: Effect of Co additive on formation of coke deposits in methane dehydro-aromatization over Mo/HZSM-5 catalyst
作者: Liu, HM;  Tian, BL;  Li, YG;  Bao, XH;  Xu, YD
关键词: methane ;  dehydro-aromatization ;  molybdenum ;  HZSM-5 zeolite ;  supported catalyst ;  cobalt ;  coke deposit ;  temperature-programmed surface reaction
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2003-02-01
卷: 24, 期:2, 页:123-128
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: Methane dehydro-aromatization (MDA) in the absence of gas-phase oxygen is one of the promising routes for direct conversion of methane into fuels and chemicals, particularly into aromatics such as benzene and toluene. MDA under non-oxidative conditions was carried out over Co-Mo/HZSM-5 catalyst, and the result suggested that the addition of Co dramatically improved the stability of Mo/HZSM-5 catalyst. Furthermore, the chemical nature and physical properties of the coke deposits formed on Co-Mo/HZSM-5 catalyst were studied by various temperature-programmed surface reactions (TPSR), such as TPH, TPCO2 and TPO, combining with TGA and TEM. The results were compared with those obtained over Mo/HZSM-5 catalyst. The TPO profiles recorded during the procedure of coke burning-off showed two peaks. The TPH experiments had effect on the coke burning-off only at high temperature. However, TPCO2 mainly resulted in the diminishing of the coke burning-off at low temperature. The TEM pictures gave evidence that a lot of filamentous carbon formed on the surface of coked catalysts during the course of TPSR, and this kind of coke deposits was not a contributor to the deactivation of catalyst. Hydrogen had no ability to react with carbon filaments, but TPCO2 experiment could eliminate them completely.
关键词[WOS]: NONOXIDATIVE CONDITIONS ;  BENZENE ;  CONVERSION ;  ZEOLITE ;  ABSENCE ;  OXYGEN
语种: 英语
WOS记录号: WOS:000181567900012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139272
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, Liaoning, Peoples R China

Recommended Citation:
Liu, HM,Tian, BL,Li, YG,et al. Effect of Co additive on formation of coke deposits in methane dehydro-aromatization over Mo/HZSM-5 catalyst[J]. CHINESE JOURNAL OF CATALYSIS,2003,24(2):123-128.
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