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    Crystal-plane effects of MFI zeolite in catalytic conversion of methanol to hydrocarbons

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    Type
    Article
    Authors
    Wang, Ning
    Sun, Wenjing cc
    Hou, Yilin
    Ge, Binghui
    Hu, Ling
    Nie, Jingqi
    Qian, Weizhong
    Wei, Fei
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Physical Science and Engineering (PSE) Division
    Date
    2018-02-15
    Online Publication Date
    2018-02-15
    Print Publication Date
    2018-04
    Permanent link to this record
    http://hdl.handle.net/10754/627249
    
    Metadata
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    Abstract
    We report the direct characterization of coke information in the clearly resolved (0 1 0) and (1 0 0) planes of various anisotropic MFI zeolites using EELS techniques, in a model reaction of methanol to hydrocarbons. For the first time, we found that the main coke species varied between different planes and depended on the crystal structure. The coke species was graphite carbon and polyaromatic hydrocarbon over MFI nanosheets and MFI with b-axis length 60 nm, respectively. The diffusion of aromatics out of conventional MFI zeolites was found only through the straight channels, while small molecules randomly diffused through both channels, resulting in different coke deposition on the (0 1 0) plane and the (1 0 0) plane from different precursors. As all product molecules diffused only through the straight channels, the MFI nanosheet showed a distinct crystal-plane selective effect of coke deposition, in contrast to nearly uniform coke distribution throughout the entire external surface for conventional zeolites. This anisotropic diffusion behavior influenced the gaseous and liquid products significantly, providing deep insight into the MFI catalyst for the selective control of products via crystal structure.
    Citation
    Wang N, Sun W, Hou Y, Ge B, Hu L, et al. (2018) Crystal-plane effects of MFI zeolite in catalytic conversion of methanol to hydrocarbons. Journal of Catalysis 360: 89–96. Available: http://dx.doi.org/10.1016/j.jcat.2017.12.024.
    Sponsors
    We thank the NSFC program (21506111, 2017YFB0602204) and the CNPC Innovation Foundation (2014D-5006-0506) for their support. National Supercomputing Center in Shenzhen (Shenzhen Cloud Computing Center) was acknowledged for providing software package.
    Publisher
    Elsevier BV
    Journal
    Journal of Catalysis
    DOI
    10.1016/j.jcat.2017.12.024
    Additional Links
    http://www.sciencedirect.com/science/article/pii/S002195171730461X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jcat.2017.12.024
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division

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