Highly stable Pt-Co bimetallic catalysts prepared by atomic layer deposition for selective hydrogenation of cinnamaldehyde

Kaiying Wang; Xiaoqing He; Jee-Ching Wang; Xinhua Liang

doi:10.1088/1361-6528/ac5540

Highly stable Pt-Co bimetallic catalysts prepared by atomic layer deposition for selective hydrogenation of cinnamaldehyde

Nanotechnology. 2022 Mar 4;33(21). doi: 10.1088/1361-6528/ac5540.

Authors

Kaiying Wang¹, Xiaoqing He^{2

3}, Jee-Ching Wang¹, Xinhua Liang¹

Affiliations

¹ Linda and Bipin Doshi Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States of America.
² Electron Microscopy Core Facility, University of Missouri, Columbia, MO 65211, United States of America.
³ Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, United States of America.

PMID: 35168219
DOI: 10.1088/1361-6528/ac5540

Abstract

Pt-Co bimetallic catalysts were deposited onγ-Al₂O₃nanoparticles by atomic layer deposition (ALD) and were used for selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL). High resolution transmission electron microscopy, hydrogen temperature-programmed reduction, x-ray diffraction, and x-ray photoelectron spectroscopy were used to identify the strong interaction between Pt and Co. The obtained catalysts with an optimal Pt/Co ratio achieved a COL selectivity of 81.2% with a CAL conversion of 95.2% under mild conditions (i.e., 10 bar H₂and 80 °C). During the CAL hydrogenation, the addition of Co on Pt significantly improved the activity and selectivity due to the synergetic effects of Pt-Co bimetallic catalysts, resulted from the transfer of electrons from Co to Pt, which can stabilize the carbonyl groups. The obtained Pt-Co bimetallic catalysts also showed excellent stability due to the strong interaction between the metal nanoparticles and the alumina support. Negligible losses in the activity and selectivity were observed during the recycling experiments, showing the potential for practical applications.

Keywords: ALD; Pt-Co bimetallic catalysts; selective hydrogenation; stability.