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Highly selective conversion of methanol to propylene: design of an MFI zeolite with selective blockage of (010) surfaces

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Abstract

As an important catalyst of methanol-to-propylene (MTP) conversion, the ZSM-5 zeolite has an anisotropic diffusion path and a large pore size, resulting in the formation of undesirable heavy aromatic by-products. Herein, we developed a surface-specific silica deposition method to block straight channels of nanosized ZSM-5 crystals selectively. By such a coating method, we can selectively suppress the yield of aromatics from the original 13% to 2.4% at 100% conversion of methanol. Trapped hydrocarbon pool species are directly confirmed by aberration-corrected S/TEM for the first time. Such a method of trapping and restricting hydrocarbon pool species in a multiscale zeolite with 10-membered rings would significantly increase its catalytic efficiency and olefin diffusion. Moreover, this provides new methodologies for zeolite structure construction and will be greatly beneficial for the industrial MTP process.

Graphical abstract: Highly selective conversion of methanol to propylene: design of an MFI zeolite with selective blockage of (010) surfaces

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Publication details

The article was received on 23 Dec 2018, accepted on 21 Mar 2019 and first published on 22 Mar 2019


Article type: Communication
DOI: 10.1039/C8NR10371B
Citation: Nanoscale, 2019, Advance Article

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    Highly selective conversion of methanol to propylene: design of an MFI zeolite with selective blockage of (010) surfaces

    D. Cai, N. Wang, X. Chen, Y. Ma, Y. Hou, X. Li, C. Zhang, Z. Chen, W. Song, M. T. Arslan, Y. Li, Y. Wang, W. Qian and F. Wei, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR10371B

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