TiO2 and ZrO2 crystals in SBA-15 silica: Performance of Pt/TiO2(ZrO2)/SBA-15 catalysts in ethyl acetate combustion

Xueguang Wang, M. V. Landau, H. Rotter, L. Vradman, A. Wolfson, A. Erenburg

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

TiO2 (40-64 wt%) and ZrO2 (48-62 wt%) were inserted in SBA-15 mesostructured silica by chemical solution decomposition or hydrolysis of the corresponding alkoxides inside the host pores. It yielded composites with 85-94% TiO2 crystallinity (anatase) and 95% crystallinity of ZrO2 (tetragonal phase). The 4.5 nm (ZrO 2) or 5.0 and 8.5 nm (TiO2) nanocrystals did not block the SBA-15 pores, and their surface was fully accessible for adsorbed nitrogen or ethyl acetate molecules. After deposition of 0.3 wt% Pt the activity of Ti(Zr)O2/SBA-15 materials in ethyl acetate combustion was proportional to the surface area of the corresponding transition metal oxide nanoparticles, being a function of their loading and crystal size. The platinized composite materials displayed 1.7-3 times higher activity compared with platinum on bulk Ti(Zr)O2 oxides prepared by the same methods and two orders of magnitude higher activity relative to Pt/SBA-15 and Pt/γ-Al2O3 catalysts.

Original languageEnglish
Pages (from-to)565-571
Number of pages7
JournalJournal of Catalysis
Volume222
Issue number2
DOIs
StatePublished - 10 Mar 2004

Keywords

  • Combustion
  • Ethyl acetate
  • Mesostructured silica
  • Nanocrystals
  • Platinum
  • Titania
  • Zirconia

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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