DEHYDRO-OLIGOMERIZATION OF METHANE TO ETHYLENE AND AROMATICS OVER MOLYBDENUM/HZSM-5 CATALYST
文献类型：期刊论文
| 作者 | CHEN, LY; LIN, LW; XU, ZS; LI, XS; ZHANG, T |
| 刊名 | JOURNAL OF CATALYSIS
 |
| 出版日期 | 1995-11-01 |
| 卷号 | 157期号:1页码:190-200 |
| ISSN号 | 0021-9517 |
| 文献子类 | Article |
| 英文摘要 | The structures of Mo/HZSM-5 catalysts with various molybdenum loadings were studied by means of XRD, IR, UV diffuse reflectance spectroscopy, TPR, and ammonia adsorption and desorption measurements. Both the BET surface areas and the acidities of catalysts decrease with an increase in molybdenum loading in the catalyst. The threshold of a monolayer dispersion of molybdenum is about 5 g of molybdenum per 100 g of HZSM-5 zeolite. Methane conversion under nonoxidizing conditions over Mo/HZSM-5 catalyst was tested. It was found that the catalyst with a molybdenum loading of 2-3 wt% exhibits optimum activity for the dehydro-oligomerization of methane to aromatics. Modifications of the 2% Mo/HZSM-5 catalyst with lithium or phosphorus cause a decrease in the acidity of the catalyst as well as in the catalyst activity. Addition of lithium shifts the selectivity toward ethylene at the expense of the yield of benzene. It is also demonstrated that the molybdenum oxide species are partially reduced by methane during the reaction. The removable lattice oxygen of molybdenum oxide oxidized adsorbed CHx species to CO, which results in a side reaction to the catalytic oligomerization of methane to aromatics. The diminution of acidity of the catalyst and the blockage of the channels of HZSM-5 zeolite due to deposited carbon may be the main reasons for the deactivation of the catalyst. The methane oligomerization reaction is proposed to be catalyzed by molybdenum species located in the zeolite channels together with the Bronsted acid sites of HZSM-5 zeolite. A synergistic effect between these two kinds of centers plays an important role in the catalysis of the title reaction. Ethylene is identified to be a primary product while benzene is a final product in the dehydro-oligomerization reaction of methane. (C) 1995 Academic Press, Inc. |
| WOS关键词 | RAY PHOTOELECTRON-SPECTROSCOPY ; HIGHER HYDROCARBONS ; PARTIAL OXIDATION ; ZEOLITES ; ALUMINA ; MOLYBDENA ; OXIDE |
| WOS研究方向 | Chemistry ; Engineering |
| 语种 | 英语 |
| 出版者 | ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS |
| WOS记录号 | WOS:A1995TB17500018 |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/167458]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 作者单位 | CHINESE ACAD SCI,DALIAN INST CHEM PHYS,DALIAN 116023,PEOPLES R CHINA |
| 推荐引用方式 GB/T 7714 | CHEN, LY,LIN, LW,XU, ZS,et al. DEHYDRO-OLIGOMERIZATION OF METHANE TO ETHYLENE AND AROMATICS OVER MOLYBDENUM/HZSM-5 CATALYST[J]. JOURNAL OF CATALYSIS,1995,157(1):190-200. |
| APA | CHEN, LY,LIN, LW,XU, ZS,LI, XS,&ZHANG, T.(1995).DEHYDRO-OLIGOMERIZATION OF METHANE TO ETHYLENE AND AROMATICS OVER MOLYBDENUM/HZSM-5 CATALYST.JOURNAL OF CATALYSIS,157(1),190-200. |
| MLA | CHEN, LY,et al."DEHYDRO-OLIGOMERIZATION OF METHANE TO ETHYLENE AND AROMATICS OVER MOLYBDENUM/HZSM-5 CATALYST".JOURNAL OF CATALYSIS 157.1(1995):190-200. |
入库方式： OAI收割
来源：大连化学物理研究所
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