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| Design and synthesis of Au-Pd/TiO2-SiO2 catalyst with high selectivity for partial oxidation of benzyl alcohol |
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WU Pingping1, SHU Jie1, WANG Yue1, ZHANG Yonghui1, ZHAO Lianming2, BAI Peng1
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(1.School of Chemistry and Chemical Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.School of Material Science and Engineering in China University of Petroleum (East China), Qingdao 266580, China)
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| Abstract: |
| Noble metal nanoparticle catalysts exhibit high catalytic activity in the partial oxidation of benzyl alcohol to benzaldehyde. However, the selectivity of benzaldehyde is low. TiO2 modified Au-Pd/TiO2-SiO2 nano alloy catalysts were prepared by a one pot method and applied for benzyl alcohol partial oxidation. It is found that the introduction of a small amount of TiO2 increases the metal dispersion on the support surface, and modifies the electronic structure of the Au-Pd alloy surface, and improves the reaction activity. Also, the number of Lewis acid sites on the support surface are increased, which improves benzaldehyde selectivity. However, the introduction of a large amount of TiO2 destroys the alloying of Au-Pd and produces a large number of Bronsted acid sites, which greatly reduces the reaction activity and product selectivity. |
| Key words: noble metal nano-catalyst partial oxidation surface acidity promoter effect |
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