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• W4764739 abstract "Thermally Stable Pt-Mesoporous Silica Core-Shell Nanocatalysts for High Temperature Reactions Sang Hoon Joo, Jeong Young Park, Chia-Kuang Tsung, Yusuke Yamada, Peidong Yang and Gabor A. Somorjai* Department of Chemistry, University of California, Berkeley, and Chemical Sciences and Materials Sciences Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. * e-mail: somorjai@berkeley.edu Recent advances in colloidal synthesis enabled the precise control of size, shape and composition of catalytic metal nanoparticles, allowing their use as model catalysts for systematic investigations of the atomic-scale properties affecting catalytic activity and selectivity. The organic capping agents stabilizing colloidal nanoparticles, however, often limit their application in high-temperature catalytic reactions. Here we report the design of a high-temperature stable model catalytic system that consists of Pt metal core coated with a mesoporous silica shell (Pt@mSiO 2 ). While inorganic silica shells encaged the Pt cores up to 750 o C in air, the mesopores directly accessible to Pt cores made the Pt@mSiO 2 nanoparticles as catalytically active as bare Pt metal for ethylene hydrogenation and CO oxidation. The high thermal stability of Pt@mSiO 2 nanoparticles permitted high-temperature CO oxidation studies, including ignition behavior, which was not possible for bare" @default.
• W4764739 created "2016-06-24" @default.
• W4764739 creator A5040807138 @default.
• W4764739 date "2010-02-10" @default.
• W4764739 modified "2023-09-26" @default.
• W4764739 title "Thermally Stable Nanocatalyst for High Temperature Reactions: Pt-Mesoporous Silica Core-Shell Nanoparticles" @default.
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• W4764739 hasPublicationYear "2010" @default.
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