Enhancing the Carbon Monoxide Oxidation Performance through Surface Defect Enrichment of Ceria-Based Supports for Platinum Catalyst

Authors

Shaohua Xie
Yue Lu
Kailong Ye
Wei Tan
Sufeng Cao
Chunying Wang
Daekun Kim
Xing Zhang
Jeremia Loukusa
Yaobin Li
Yan Zhang
Lu Ma
Steven N Ehrlich
Nebojsa S Marinkovic
Jiguang Deng
Maria Flytzani-Stephanopoulos
Fudong Liu

Publication Date

7-16-2024

Journal

Environmental Science & Technology

Abstract

Effective synthesis and application of single-atom catalysts on supports lacking enough defects remain a significant challenge in environmental catalysis. Herein, we present a universal defect-enrichment strategy to increase the surface defects of CeO2-based supports through H2 reduction pretreatment. The Pt catalysts supported by defective CeO2-based supports, including CeO2, CeZrOx, and CeO2/Al2O3 (CA), exhibit much higher Pt dispersion and CO oxidation activity upon reduction activation compared to their counterpart catalysts without defect enrichment. Specifically, Pt is present as embedded single atoms on the CA support with enriched surface defects (CA-HD) based on which the highly active catalyst showing embedded Pt clusters (PtC) with the bottom layer of Pt atoms substituting the Ce cations in the CeO2 surface lattice can be obtained through reduction activation. Embedded PtC can better facilitate CO adsorption and promote O2 activation at PtC–CeO2 interfaces, thereby contributing to the superior low-temperature CO oxidation activity of the Pt/CA-HD catalyst after activation.

Keywords

Carbon Monoxide, Platinum, Catalysis, Oxidation-Reduction, Cerium, Adsorption, Surface Properties, surface defect enrichment, Pt single-atom catalyst, embedded Pt cluster, CO adsorption, O2 activation

Comments

Supplementary Materials

PMID: 38958431