Unusual size effect of spinel Co0.5Fe0.5Al2O4 supported Pt catalysts on the selective hydrogenation of cinnamaldehyde

作者：Li, Mengnan; Xin, Huiyue; Song, Tongyang; Zhao, Chen; Wu, Peng; Li, Xiaohong^*

来源：Catalysis Communications, 2023, 181: 106736.

DOI：10.1016/j.catcom.2023.106736

• Size effect
• Pt/Co0.5Fe0.5Al2O4~ catalyst
• Cinnamaldehyde
• Selective hydrogenation

Pt/Co0.5Fe0.5Al2O4 catalysts with the average Pt particle size of 1.6-3.4 nm were prepared and applied to the selective hydrogenation of cinnamaldehyde (CAL). Not only the TOF was promoted from 0.19 to 2.70 s(-1), but also the selectivity to cinnamyl alcohol (COL) was improved from 68% to 94%, with the increase of Pt particle size. Stronger interaction occurred between Co0.5Fe0.5Al2O4 and smaller-sized Pt particles, resulting in electron-deficient Pt particles, so that C=O and C=C bond could be activated simultaneously. However, electron-rich Pt species existed on Pt/Co0.5Fe0.5Al2O4 with larger Pt size, which is beneficial for the preferential activation of C=O bond.