Mechanochemically assisted hydrothermal synthesis of Sn-substituted MFI-type silicates

Kiyoshi Kanie, Moe Sakaguchi, Fumiya Muto, Mami Horie, Masafumi Nakaya, Toshiyuki Yokoi, Atsushi Muramatsu

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Substitution of Al atoms in a zeolite framework by catalytic metal atoms has attracted considerable attention because the catalytic behavior can be tuned by the substituted atoms. In the present study, Sn-substituted MFI-type silicates were synthesized using a hydrothermal reaction of an amorphous Si-O-Sn precursor prepared by mechanochemical grinding of SiO2 and Sn(OH)4. The mechanochemical treatment was found to be a key technique for obtaining the amorphous Si-O-Sn precursor, where tetrahedral Sn4+ species were incorporated into the amorphous matrix. The Sn content in the framework of the MFI-type silicates was successfully controlled by the initial HCl/Si molar ratio of the hydrothermal procedures. Optical reflectance measurements revealed that the Sn4+ ions were dispersedly incorporated into the silicate framework while preserving the initial tetrahedrally coordinated species. Infrared results imply that the resulting Sn-substituted MFI-type silicate has Brønsted acid character. Precise control of the Brønsted and Lewis acid properties by Sn doping is a promising approach to the development of novel types of zeolite-based catalytic materials.

Original languageEnglish
Pages (from-to)545-553
Number of pages9
JournalScience and Technology of Advanced Materials
Volume19
Issue number1
DOIs
Publication statusPublished - 2018 Dec 31

Keywords

  • 10 Engineering and Structural materials
  • 102 Porous / Nanoporous / Nanostructured materials
  • 301 Chemical syntheses / processing
  • MFI
  • Mechanochemical
  • hydrothermal
  • silicate
  • zeolite

ASJC Scopus subject areas

  • Materials Science(all)

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