Issue 20, 2023

Carbon doping of ceria-supported palladium for the low-temperature oxidation of methane

Abstract

Cerium oxide-supported palladium nanoparticles (Pd/CeO2) are poorly active toward the remediation of lean-burn exhausts at a “cold start” (operation temperature <300 °C) due to the presence of excessive palladium oxide (PdO) over the surface. Pd/CeO2 was prepared by the wetness-impregnation method and subjected to a gas stream of methane (CH4) and oxygen (O2) at 230 °C. The supported Pd nanoparticles were partly converted to palladium carbide (PdCx) due to carbon doping during this atmosphere treatment. This atmosphere-treated Pd/CeO2 material exhibited improved catalytic performance towards remediation of a simulated lean-burn exhaust containing CH4 and excessive O2. Comprehensive characterization (scanning transmission electron microscopy, X-ray photoemission spectroscopy, thermogravimetry analysis/differential thermal analysis) of the material demonstrated that the improved catalytic performance of atmosphere-treated Pd/CeO2 could be attributed to the oxidative decomposition of PdCx species during catalysis, which created surface Pd sites to promote remediation of the lean-burn exhaust at <300 °C.

Graphical abstract: Carbon doping of ceria-supported palladium for the low-temperature oxidation of methane

Supplementary files

Article information

Article type
Paper
Submitted
18 May 2023
Accepted
21 Jun 2023
First published
01 Jul 2023

Catal. Sci. Technol., 2023,13, 5842-5847

Carbon doping of ceria-supported palladium for the low-temperature oxidation of methane

T. Hihara, Y. Banno, M. Nagata, T. Fujita and H. Abe, Catal. Sci. Technol., 2023, 13, 5842 DOI: 10.1039/D3CY00694H

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