Xiang Feng, Xuezhi Duan, G. Qian
Aug 1, 2014
Citations
1
Influential Citations
69
Citations
Journal
Journal of Catalysis
Abstract
Abstract Propene epoxidation with H 2 /O 2 is a typical structure-sensitive reaction. For a given support containing tetra-coordinated Ti species such as TS-1, the catalytic activity is greatly influenced by supported Au nanoparticle size. The identification of size-dependent activity of Au catalyst was achieved over a series of Au nanoparticles (2.6–5.1 nm) deposited on the exterior surface of TS-1 by employing uncalcined TS-1. Through this approach, we could obtain very stable Au catalysts with distinguishable and uniform-sized Au particles, which are critical for structure-sensitivity analysis. The PO formation rate (mol PO s −1 mol Au −1 ) over these catalysts was found to vary with average Au diameter ( d ) as d −2.7±0.3 . Moreover, typical Au nanoparticles on uncalcined TS-1 appeared as truncated cuboctahedron with top facet of (1 1 1). Model calculations derived from the representative Au particle shape and the above size-dependent activity were then performed to show that corner sites of Au nanoparticles are dominant Au active sites for propene epoxidation.