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The effect of TiO2 particle size on the characteristics of Au–Pd/TiO2 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
49905 46773 2015 6 PDF Available
Title
The effect of TiO2 particle size on the characteristics of Au–Pd/TiO2 catalysts
Abstract

•Au–Pd catalysts were prepared on TiO2 with average crystallite sizes 9 and 15 nm.•The size of Au–Pd alloy depended on the TiO2 crystallite size.•Electronic effect by Au–Pd alloy formation was more pronounced on the larger TiO2.•Au acted as an electronic promoter for Pd, which promoted 1-heptene hydrogenation.

The nanocrystalline TiO2 materials with average crystallite sizes of 9 and 15 nm were synthesized by the solvothermal method and employed as the supports for preparation of bimetallic Au/Pd/TiO2 catalysts. The average size of Au–Pd alloy particles increased slightly from sub-nano (< 1 nm) to 2–3 nm with increasing TiO2 crystallite size from 9 to 15 nm. The catalyst performances were evaluated in the liquid-phase selective hydrogenation of 1-heptyne under mild reaction conditions (H2 1 bar, 30 °C). The exertion of electronic modification of Pd by Au–Pd alloy formation depended on the TiO2 crystallite size in which it was more pronounced for Au/Pd on the larger TiO2 (15 nm) than on the smaller one (9 nm), resulting in higher hydrogenation activity and lower selectivity to 1-heptene on the former catalyst.

Keywords
1-Heptyne; Selective hydrogenation; TiO2; Pd–Au bimetallic catalysts
First Page Preview
The effect of TiO2 particle size on the characteristics of Au–Pd/TiO2 catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 58, 5 January 2015, Pages 70–75
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis