Design of Nano-Sized Pt Metals Synthesized on Ti-Containing Mesoporous Silicas and Efficient Catalytic Application for NO Reduction

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 L III -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.

Free-standing highly ordered mesoporous carbon–silica composite thin films

“…The mesoporous thin lms have been receiving considerable attention due to their unique properties, such as the enhancement of the interface effect and 2D extension, 16 thus providing great potential in catalysis, 17 sensing, 18 electronic devices, 19 energy storage, 20 and so on. Furthermore, mesoporous thin lms, when congured in free-standing forms, can serve as electrical or ltration devices, 21 and can be transferred and attached to arbitrary substrates that are even not compatible with high calcination temperatures, such as polymer-based substrates for exible electronic devices.…”