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

• Published in: Catalysis communications Vol. 181; p. 106736
• Main Authors: Li, Mengnan, Xin, Huiyue, Song, Tongyang, Zhao, Chen, Wu, Peng, Li, Xiaohong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2023; Elsevier
• Subjects: Cinnamaldehyde; Pt/Co0.5Fe0.5Al2O4 catalyst; Selective hydrogenation; Size effect; Cinnamaldehyde; Selective hydrogenation; Size effect; Pt/Co0.5Fe0.5Al2O4 catalyst
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2023.106736

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 CO and CC 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 CO bond. [Display omitted] •Size dependence was observed on Pt/Co0.5Fe0.5Al2O4 catalysts with various Pt sizes.•Pt particle size varies within 1.6–3.4 nm by changing Pt loading from 0.3 to 5 wt%.•Larger Pt nanoparticles favors higher selectivity to cinnamyl alcohol.•Pt particles with various sizes have various interaction with spinel Co0.5Fe0.5Al2O4.•The electronic states of Pt sites affect the adsorption mode of cinnamaldehyde.