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Selective hydrogenation of acetylene in excess ethylene on micron-sized and nanocrystalline TiO2 supported Pd catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44520 46037 2006 6 PDF Available
Title
Selective hydrogenation of acetylene in excess ethylene on micron-sized and nanocrystalline TiO2 supported Pd catalysts
Abstract

Physicochemical properties and catalytic performances of Pd catalysts supported on commercial micron-sized and nanocrystalline TiO2 synthesized by sol–gel and solvothermal method were studied for the selective hydrogenation of acetylene in the presence of excess ethylene. While acetylene conversions were found to be merely dependent on Pd dispersion, ethylene selectivity appeared to be strongly affected by the presence of Ti3+ in the TiO2 samples. The use of pure anatase TiO2 (either micron- or nano-sized) that contained significant amount of Ti3+ as supports for Pd catalysts gave high ethylene selectivities, while the use of pure rutile TiO2 (without Ti3+ present) resulted in ethylene loss. The results suggest that the effect of Ti3+ on the TiO2 supports was more important for high ethylene selectivity than the effect of TiO2 crystallite size for selective acetylene hydrogenation over Pd/TiO2 catalysts.

Keywords
Selective acetylene hydrogenation; Pd/TiO2; Nanocrystalline TiO2; Sol–gel; Solvothermal; Defect
First Page Preview
Selective hydrogenation of acetylene in excess ethylene on micron-sized and nanocrystalline TiO2 supported Pd catalysts
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 314, Issue 1, 25 October 2006, Pages 128–133
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis