Effect of Ga substitution with Al in ZSM-5 zeolite in methanethiol-to-hydrocarbon conversion

DOI HANDLE PubMed Open Access
  • Watanabe, Ryo
    Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University
  • Oba, Natsu
    Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University
  • Smith, Suchada
    Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University
  • Oshima, Kazumasa
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Kishida, Masahiro
    Department of Chemical Engineering, Faculty of Engineering, Kyushu University
  • Miyake, Koji
    Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University
  • Nishiyama, Norikazu
    Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University
  • Verma, Priyanka
    Department of Chemistry, Indian Institute of Technology Delhi
  • Fukuhara, Choji
    Department of Applied Chemistry and Biochemical Engineering, Graduate School of Engineering, Shizuoka University

Description

The catalytic properties of conventional H-[Al]-ZSM-5 and gallium-substituted H-[Ga]-ZSM-5 were evaluated in the conversion of methanethiol to ethylene (CH_3SH → 1/2C_2H_4 + H_2S). Dimethyl sulfide (DMS), aromatics, and CH_4 were formed as byproducts on the H-[Al]-ZSM-5 catalyst. The introduction of Ga into the ZSM-5 structure provided a high ethylene yield with relatively high selectivity for olefins. Based on the temperature-programmed desorption of NH_3 and pyridine adsorption on zeolites, the strength of acid sites was decreased by introducing Ga into the ZSM-5 structure. Undesirable reactions seemed less likely to occur at weakly acidic sites. The suppression of the formation of dimethyl sulfide (CH_3SH → 1/2C_2H_6S + 1/2H_2S) and the sequential reaction of ethylene to produce aromatics provided a high yield of ethylene over H-[Ga]-ZSM-5.

Journal

  • RSC Advances

    RSC Advances 13 (31), 21441-21447, 2023-07-18

    Royal Society of Chemistry (RSC)

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