High-performance Pd-Au bimetallic catalyst with mesoporous silica nanoparticles as support and its catalysis of cinnamaldehyde hydrogenation

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• 作者：Xu Yang^a ; ^b ; Dan Chen^a ; ^b ; Shijun Liao^a ; ^b ; ^{chsjliao@scut.edu.cn} ; Huiyu Song^a ; ^b ; Yingwei Li^a ; ^b ; Zhiyong Fu^a ; ^b ; Yunlan Su^c
• 关键词：Bimetallic ; Cinnamaldehyde hydrogenation ; Mesoporous silica ; Pd&ndash ; Au ; Synergistic effect
• 刊名：Journal of Catalysis
• 出版年：2012
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：July, 2012
• 卷：291
• 期：Complete
• 页码：36-43
• 文件大小：2381 K

摘要

A high-performance bimetallic catalyst with mesoporous silica nanoparticles as support, PdAu/MSN, was prepared by an organic impregnation-hydrogen reduction approach. A series of investigations were conducted to assess the effects of (i) the porous nanoparticle support on the dispersion of active components and on the catalyst鈥檚 performance, (ii) the addition of gold on the dispersion of active components and the catalyst鈥檚 activity, and (iii) the preparation parameters, such as solvent, pressure, and temperature, on the catalyst鈥檚 activity. The active metallic components were highly dispersed, with particle size 2.5 nm. The addition of gold to the catalyst favorably promoted the hydrogenation of cinnamaldehyde. The activity of PdAu_0.2/MSN (with Au/Pd molar ratio 0.2:1) was up to four times higher than that of Pd/MSN (without Au as a promoter) and eight times higher than that of commercial Pd/C catalyst. The enhanced activity of PdAu_0.2/MSN can be attributed to the synergistic effect of Pd with the added Au and the highly dispersed active components. The ultrahigh activity, as well as its novel structure with controllable compositions, makes this catalyst very attractive for both fundamental research and practical applications.