Hydrothermal synthesis of Ga-substituted MFI zeolites via a mechanochemical process and their catalytic activity for methane transformation

Mizuho Yabushita, Motohiro Yoshida, Fumiya Muto, Mami Horie, Yusuke Kunitake, Toshiki Nishitoba, Sachiko Maki, Kiyoshi Kanie, Toshiyuki Yokoi, Atsushi Muramatsu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The isomorphous substitution of zeolite framework is a useful means of improving the catalytic performance of zeolites. Such materials are also known to sometimes show catalytic behaviors that typical aluminosilicate zeolites do not exhibit. In the work reported herein, a two-step synthesis method comprising mechanochemical and hydrothermal treatments was used to synthesize Ga-substituted MFI-type zeolites ([Ga]-MFI) with various Si/Ga ratios. The initial planetary ball milling of SiO2 and β-Ga2O3 was central to this synthetic method as it induced mechanochemical reaction between these oxides, which resulted in the formation of amorphous composite containing Si–O–Ga linkages. A subsequent hydrothermal synthesis employing this composite as a source of both Si and Ga gave MFI zeolites incorporating tetrahedral Ga species in their frameworks. A [Ga]-MFI synthesized in this manner with a Si/Ga ratio of 50 selectively transformed methane into CO in the presence of oxygen. In contrast, [Ga]-MFI prepared viaa conventional one-pot hydrothermal synthesis accelerated the complete oxidation to produce CO2.

Original languageEnglish
Article number110579
JournalMolecular Catalysis
Volume478
DOIs
Publication statusPublished - 2019 Nov

Keywords

  • Gallium
  • Isomorphous substitution
  • MFI zeolite
  • Mechanochemical reaction
  • Methane transformation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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