Properties of metal species in square-shape mesopores of KSW-2-based silica

Tatsuo Kimura, Shengjun Huang, Atsushi Fukuoka, Kazuyuki Kuroda

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Properties arising from 2-D orthorhombic mesoporous silica (KSW-2) were investigated for each structural feature: (1) periodicity in silicate framework and (2) square-shape mesopore. Titanium species were grafted onto the periodic silica walls of KSW-2-based mesoporous silica through silylation with octylmethyldichlorosilane in the presence of organotitanium compounds with cyclopentadienyl ligands. The surface TiO4 units formed after calcination at 550 °C showed a higher activity in the oxidation of cyclohexene with peroxides than those onto FSM-16 and MCM-41 grafted in the same manner, indicating that (1) the periodicity in the framework influenced the catalytic activity due to the heteroatoms fixed at the silicate surfaces. The synthesis of metallic Pt species inside square-shape mesopores of KSW-2-based silica was conducted by reduction of impregnated H2PtCl6. Considering the morphology of metallic Pt species formed through wet H 2 and UV reduction, it is considered that (2) the square-shape mesopore is useful for suppressing the sintering of metallic Pt species.

Original languageEnglish
Pages (from-to)3859-3866
Number of pages8
JournalJournal of Materials Chemistry
Volume19
Issue number23
DOIs
Publication statusPublished - 2009 Jun 19

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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