Abstract
A novel method to prepare the nano-sized Pt metal catalysts is proposed. Mesoporous silicas containing highly dispersed titanium oxide species (Ti-HMS) can act as the platform to generate highly dispersed Pt metal particles. Characterization by Pt LIII-egde XAFS, CO adsorption, and TEM analyses revealed that the size of formed Pt metal particles depends on the presence of titanium oxide species and that the smaller sizes of Pt metal particles was obtained with increasing the Ti contents in the silica matrix. These nano-sized Pt metal catalysts are useful as efficient catalysts for NO reduction, and higher conversion could be attained with smaller size of Pt metal particles. The present technique using Ticontaining mesoporous silicas as catalyst supports make a great contribution to minimize the amount of precious metals in order to meet today’s industrial requirements. [doi:10.2320/matertrans.ML200702]
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