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题名: Comparative investigation of the deactivation behaviors over HZSM-5 and HSAPO-34 catalysts during low-temperature methanol conversion
作者: Qi, Liang1, 2;  Li, Jinzhe1;  Wang, Linying1;  Wang, Chan1;  Xu, Lei1;  Liu, Zhongmin1
刊名: CATALYSIS SCIENCE & TECHNOLOGY
发表日期: 2017-05-21
DOI: 10.1039/c7cy00024c
卷: 7, 页:2022-2031
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The deactivation mechanism for the methanol conversion reaction at low temperature was comparatively investigated over HZSM-5 and HSAPO-34 catalysts. Two obviously different deactivation phenomena were directly observed: two-staged deactivation behavior over the HZSM-5 catalyst and exponential- type deactivation behavior over the HSAPO-34 catalyst. Since the start of the deactivation, the amount of the retained species over the HZSM-5 catalyst kept unchanged while the amount over the HSAPO-34 catalyst obviously increased. Both types of deactivation behavior presented an intimate relationship with the accumulation of retained species and their changing reactivity. After detailed characterization and analysis, it was interestingly found that the deactivation of the HZSM-5 catalyst originated from the "overloading effect" of methylbenzenes(smaller than pentamethylbenzene) which are intrinsically active during the autocatalysis reaction stage, while the deactivation of the HSAPO-34 catalyst was caused by accumulation of inactive methyladamantanes, and it was further deduced that the deactivation proceeded from "external to internal" for the HSAPO-34 catalyst. Enhancement of the catalyst diffusivity could effectively extend the catalyst lifetime for the HZSM-5 catalyst, but seemed less effective for the HSAPO-34 catalyst.
关键词[WOS]: TO-OLEFIN CONVERSION ;  STATE NMR-SPECTROSCOPY ;  ZEOLITE H-ZSM-5 ;  COKE FORMATION ;  REACTION-MECHANISM ;  INDUCTION PERIOD ;  HYDROCARBONS CONVERSION ;  MOLECULAR-SIEVES ;  REACTION CENTERS ;  CARBENIUM IONS
语种: 英语
WOS记录号: WOS:000401907700007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152269
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, iChEM Collaborat Innovat Ctr Chem Energy Mat, Natl Engn Lab Methanol Olefins,Dalian Natl Lab Cl, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Qi, Liang,Li, Jinzhe,Wang, Linying,et al. Comparative investigation of the deactivation behaviors over HZSM-5 and HSAPO-34 catalysts during low-temperature methanol conversion[J]. CATALYSIS SCIENCE & TECHNOLOGY,2017,7:2022-2031.
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