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Effect of Support Crystallite Size on Catalytic Activity and Deactivation of Nanocrystalline ZnAl2O4-Supported Pd Catalysts in Liquid-Phase Hydrogenation |
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| Authors: | Terachai Sirikajorn Okorn Mekasuwandumrong Piyasan Praserthdam James G Goodwin Jr Joongjai Panpranot |
| Affiliation: | 1. Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand 2. Department of Chemical Engineering, Silpakorn University, Sanam Chandra Palace Campus, Nakorn Pathom, 73000, Thailand 3. Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, 29634, USA |
| Abstract: | The catalytic activity and deactivation of nanocrystalline ZnAl2O4-supported Pd catalysts were investigated for the liquid-phase hydrogenation under mild conditions. Nanocrystalline ZnAl2O4 spinels with average crystallite size between 8 and 33 nm were synthesized by the solvothermal method in toluene. Higher turnover frequencies for 1-heptyne hydrogenation and less deactivation due to Pd leaching were obtained for the Pd/ZnAl2O4-33 nm catalyst. XPS and ESR results suggest that the presence of defects in larger crystallite size ZnAl2O4 resulted in higher Pd dispersion and stronger interaction between Pd and the support. |
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