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dc.contributor.authorWang, Ning
dc.contributor.authorHou, Yilin
dc.contributor.authorSun, Wenjing
dc.contributor.authorCai, Dali
dc.contributor.authorChen, Zhaohui
dc.contributor.authorLiu, Lingmei
dc.contributor.authorGe, Binghui
dc.contributor.authorHu, Ling
dc.contributor.authorQian, Weizhong
dc.contributor.authorWei, Fei
dc.date.accessioned2018-12-31T13:52:35Z
dc.date.available2018-12-31T13:52:35Z
dc.date.issued2018-11-12
dc.identifier.citationWang N, Hou Y, Sun W, Cai D, Chen Z, et al. (2019) Modulation of b-axis thickness within MFI zeolite: Correlation with variation of product diffusion and coke distribution in the methanol-to-hydrocarbons conversion. Applied Catalysis B: Environmental 243: 721–733. Available: http://dx.doi.org/10.1016/j.apcatb.2018.11.023.
dc.identifier.issn0926-3373
dc.identifier.doi10.1016/j.apcatb.2018.11.023
dc.identifier.urihttp://hdl.handle.net/10754/630608
dc.description.abstractThe conversion of methanol-to-hydrocarbons (MTH) has been studied over a series of Zn/ZSM-5 zeolites with different thickness of b-axis, as well as similar lengths of a-axis. It has been demonstrated that the decrease of b-axis thickness from 220 nm to 2 nm leads to the remarkably longer lifetime, accompanied by the shift of selectivity toward trimethylbenzene and increased coke tolerance capacity. Methylbenzenes, as the intermediate product of the aromatic-based cycle, can diffuse out of the straight channels in the Zn/ZSM-5 nanosheet quickly, suppressing the aromatic-based cycle. The evolution of coke species, including the quantity, types, and location, as a function of the reaction time, has been systematically investigated. During the initial reaction period, the coke preferentially forms in mesopores and then is deposited mainly in micropores as the reaction proceeds. The Zn/ZSM-5 nanosheet shows a crystal face dependency on coke deposition, which mainly occurs on the (010) surface because the diffusion of product molecules is found to be only through the straight channels. But, for the conventional Zn/ZSM-5 catalyst, the diffusion of small molecule products is through both channels, while aromatics are only diffused through the straight channels, which leads to the significant difference of coke densities and sp2/sp3 ratios on the (010) and (100) surfaces. The adsorption simulations indicate that butene and p-xylene are the largest molecules which diffuse through the sinusoidal channels and the straight channels, respectively.
dc.description.sponsorshipThis work is supported by the National Natural Science Foundation of China (21506111) and National Key R&D Program of China (2017YFB0602204 and 2018YFB0604803).
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S0926337318310737
dc.subjectMFI zeolite
dc.subjectb-axis thickness
dc.subjectAnisotropy
dc.subjectCoke formation
dc.subjectMethanol-to-hydrocarbons
dc.titleModulation of b-axis thickness within MFI zeolite: Correlation with variation of product diffusion and coke distribution in the methanol-to-hydrocarbons conversion
dc.typeArticle
dc.contributor.departmentAdvanced Membranes and Porous Materials Research Center
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalApplied Catalysis B: Environmental
dc.contributor.institutionBeijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
dc.contributor.institutionChina-America Cancer Research Institute, Key Laboratory for Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong 523808, China
dc.contributor.institutionBeijing National Laboratory for Condensed Mater Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
kaust.personWang, Ning
kaust.personLiu, Lingmei
dc.date.published-online2018-11-12
dc.date.published-print2019-04


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