Journal Article

Pt/Ce–La Nanocomposite for Hydrogenation Promoted by a Synergistic Effect of Support with Redox and Basic Property

Xue, Bing, Xu, Jie, Wang, Fei, Liu, Na, Wu, Zeying, Li, Gao, Wei, Xuejiao, Yu, Zairan

2022

Overview

The catalytic behavior of hydrogenations is often intimately associated with the supports of Pt-based catalysts. And the issue of support effects is not well resolved yet. We systematically study the support effect using three representative supports, reducible CeO2, basic La2O2CO3 and Ce–La composite with redox and basic properties. The Pt/Ce–La catalyst are well characterized by a serial of methods, such as X-ray powder diffraction, transmission electron microscopy, N2-sorption, X-ray photoelectron spectroscopy, temperature-programmed reduction of H2 (H2-TPR), temperature programmed desorption of CO2 (CO2-TPD) and Raman. Ce–La composite exhibits best catalytic activity in the selective hydrogenation of cinnamaldehyde (CAL). The excellent catalytic performance of Pt/Ce–La composite is mainly ascribed to the optimal electronic Pt-support interactions on the redox sites and appropriate CAL adsorption ability at the basic sites. In all, the recombination of basic sites and redox ability are the critical requirements for the design of efficient catalysts.We prepared a CeO2–La2O2CO3 nanocomposite with redox and basic property for anchoring Pt nanoparticles. The Pt/Ce–La catalyst exhibited enhanced catalytic activity in the selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (CMO) with a good TOF of 2701 h−1, which was much higher than the counterparts of Pt/CeO2 and Pt/La2O2CO3. The synergistic effect between basic La2O2CO3 and redox CeO2 leads to the obviously improved catalytic activity.

• Publisher: Springer Nature B.V
• Subject: Carbon dioxide / Catalysts / Catalytic activity / Cerium oxides / Cinnamaldehyde / Hydrogenation / Nanocomposites / Nanoparticles / Photoelectrons / Synergistic effect / X ray powder diffraction