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题名: Chemical characteristics of coke on Mo/HZSM-5 catalysts for methane dehydroaromatization under nonoxidative conditions by TP techniques
作者: Liu, HM;  Li, T;  Xu, YD
关键词: methane dehydro-aromatization ;  HZSM-5 zeolite ;  TG ;  TPR ;  coke
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2002-08-01
卷: 23, 期:8, 页:1556-1561
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Over Mo/HZSM-5 catalysts, various carbonaceous depositions occurred during the course of methane dehydroaromatization(MDA). These species of surface carbon formed on HZSM-5 zeolite or Mo/HZSM-5 catalysts with different Mo loadings were investigated by means of TPH, TPCOz and TPO in combination with thermal gravimetric analysis(TG). The results of TG revealed that, the total amount of coke formed on 6Mo/MCM-22 (luring TPSR is larger than those formed on HZSM-5 zeolite, 2Mo/HZSM-5 and 10Mo/HZSM-5 catalysts. The TPO profiles recorded during the procedure of coke burning-off show two different temperature peaks. The results of TPO and TG after TPH suggested that, the TPH experiments only had an effect on the coke burnt-off at a high temperature, but didn't result in the diminishing of the coke burnt-off at low temperature peak. On the other hand, the result of the coked catalyst after succeeding TPM experiments exhibited an obvious reduction in the areas of both the high and low temperature peaks, particularly in the area of the low temperature peak. The study on the catalysts with different Mo loadings suggested that, the percentage of the coke burnt-off at a low temperature turned larger with the increase of Mo loading, respectively. And the change trend of the coke burnt-off at a high temperature was opposite exactly. By using the experiments of TPSR, TPH, TPCO2 and TG, quantitative analysis of the coke and the kinetics of its burning-off process have been done. The results show that, either TPH or TPCO2 can diminish the starting temperature and decrease the activation energy, and there are some differences among the catalysts with various Mo loadings.
关键词[WOS]: DEHYDRO-AROMATIZATION ;  HZSM-5 ZEOLITE ;  BENZENE ;  CONVERSION ;  DEHYDROGENATION ;  ABSENCE ;  OXYGEN ;  CO/CO2 ;  NMR
语种: 英语
WOS记录号: WOS:000177411000026
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139084
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:
Liu, HM,Li, T,Xu, YD. Chemical characteristics of coke on Mo/HZSM-5 catalysts for methane dehydroaromatization under nonoxidative conditions by TP techniques[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2002,23(8):1556-1561.
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