Abstract
TiO 2 (40–64 wt%) and ZrO 2 (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% TiO 2 crystallinity (anatase) and >95% crystallinity of ZrO 2 (tetragonal phase). The 4.5 nm (ZrO 2) or 5.0 and 8.5 nm (TiO 2) 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)O 2/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)O 2 oxides prepared by the same methods and two orders of magnitude higher activity relative to Pt/SBA-15 and Pt/ γ-Al 2O 3 catalysts.
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