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题名: Effect of cofeeding n-butane with methanol on aromatization performance and coke formation over a Zn loaded ZSM-5/ZSM-11 zeolite
作者: Song, Chao1, 2;  Liu, Kefeng1, 2;  Zhang, Dazhou1, 2;  Liu, Shenglin1;  Li, Xiujie1;  Xie, Sujuan1;  Xu, Longya1
关键词: Methanol ;  n-Butane ;  Aromatization ;  Cofeeding ;  Coke
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2014-01-30
DOI: 10.1016/j.apcata.2013.10.036
卷: 470, 页:15-23
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: The aromatization performance of cofeeding n-butane with methanol was investigated in a fixed bed reactor over a Zn loaded ZSM-5/ZSM-11 zeolite. Coke deposited on the catalyst was characterized by TG, TPO, FTIR and Raman technique. During the 48 h life-test under the conditions of 510 degrees C, 0.4 MPa, WHSV (CH2) = 2 h(-1), pure n-butane reaction performance of the catalyst changes little, but high LPG and low aromatics yields are obtained. Only under the suitable n-butane/methanol ratio, the relatively good aromatics selectivity can be obtained and maintained during the reaction process. Compared with methanol aromatization, the integrated process exhibits a much slower rate of deactivation. Addition of methanol in n-butane inhibits the dry gas production while promotes the LPG production. Water generated from methanol dehydration may occupy the catalytic active sites for olefins aromatization over the catalyst and thus suppress the production of total aromatics. In fact, water mainly suppresses benzene formation and this inhibiting effect increases with n-butane content in the feed, in contrast to its promoting effect on formation of C-8 and C-9 aromatics. Increasing methanol content in the feed, a simultaneous increase in coke content of the spent catalyst and preference for coke deposition in micropore is observed. Furthermore, the fraction of aliphatics in coke decreases, while those of less-condensed aromatics and polyaromatics incease, which is associated with the increased deactivation of catalyst. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
关键词[WOS]: AMORPHOUS-CARBON ;  CATALYTIC ROLE ;  HIGHER ALKANES ;  LIGHT ALKANES ;  PORE SYSTEMS ;  HYDROCARBONS ;  ZSM-5 ;  DEACTIVATION ;  CONVERSION ;  TRANSFORMATION
语种: 英语
WOS记录号: WOS:000330822900003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143197
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
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Song, Chao,Liu, Kefeng,Zhang, Dazhou,et al. Effect of cofeeding n-butane with methanol on aromatization performance and coke formation over a Zn loaded ZSM-5/ZSM-11 zeolite[J]. APPLIED CATALYSIS A-GENERAL,2014,470:15-23.
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