Issue 13, 2021

Size-dependent strong metal–support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol

Abstract

Strong metal–support interaction (SMSI) has long been studied in catalytic reactions. Proper utilization of the SMSI effect might not only improve the stability of the catalysts, but also the activity and selectivity. In this work, using the atomic layer deposition (ALD) technique, we synthesized a series of Pd/ZnO catalysts with Pd particle sizes ranging from 1.6 to 7.9 nm. Upon H2 reduction at elevated temperatures, these Pd/ZnO catalysts display a size-dependent SMSI effect wherein the larger-size Pd particles are more prone to be encapsulated by ZnO compared to the smaller ones. In the reaction of CO2 hydrogenation, we show that such size-dependent SMSI, together with the size-related CO binding strength on Pd particles, provides a higher activity and methanol selectivity to the Pd particles larger than ~2.5 nm.

Graphical abstract: Size-dependent strong metal–support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol

Supplementary files

Article information

Article type
Paper
Submitted
07 Apr 2021
Accepted
14 May 2021
First published
20 May 2021

Catal. Sci. Technol., 2021,11, 4398-4405

Size-dependent strong metal–support interaction in Pd/ZnO catalysts for hydrogenation of CO2 to methanol

L. Zhang, X. Liu, H. Wang, L. Cao, C. Huang, S. Li, X. Zhang, Q. Guan, X. Shao and J. Lu, Catal. Sci. Technol., 2021, 11, 4398 DOI: 10.1039/D1CY00606A

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