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Comparative investigation of the deactivation behaviors over HZSM-5 and HSAPO-34 catalysts during low-temperature methanol conversion
Qi, Liang1,2; Li, Jinzhe1; Wang, Linying1; Wang, Chan1; Xu, Lei1; Liu, Zhongmin1
Source PublicationCATALYSIS SCIENCE & TECHNOLOGY
2017-05-21
DOI10.1039/c7cy00024c
Volume7Pages:2022-2031
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordTO-OLEFIN CONVERSION ; STATE NMR-SPECTROSCOPY ; ZEOLITE H-ZSM-5 ; COKE FORMATION ; REACTION-MECHANISM ; INDUCTION PERIOD ; HYDROCARBONS CONVERSION ; MOLECULAR-SIEVES ; REACTION CENTERS ; CARBENIUM IONS
AbstractThe 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.
Language英语
WOS IDWOS:000401907700007
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/152269
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Qi, Liang,Li, Jinzhe,Wang, Linying,Wang, Chan,Xu, Lei,&Liu, Zhongmin.(2017).Comparative investigation of the deactivation behaviors over HZSM-5 and HSAPO-34 catalysts during low-temperature methanol conversion.CATALYSIS SCIENCE & TECHNOLOGY,7,2022-2031.
MLA Qi, Liang,et al."Comparative investigation of the deactivation behaviors over HZSM-5 and HSAPO-34 catalysts during low-temperature methanol conversion".CATALYSIS SCIENCE & TECHNOLOGY 7(2017):2022-2031.
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