Mesoporous Silica-Supported Nanostructured PdO/CeO2 Catalysts for Low-Temperature Methane Oxidation

Yiling Dai; Vanama Pavan Kumar; Chujie Zhu; Mark J MacLachlan; Kevin J Smith; Michael O Wolf

doi:10.1021/acsami.7b13408

Mesoporous Silica-Supported Nanostructured PdO/CeO₂ Catalysts for Low-Temperature Methane Oxidation

ACS Appl Mater Interfaces. 2018 Jan 10;10(1):477-487. doi: 10.1021/acsami.7b13408. Epub 2017 Dec 20.

Authors

Yiling Dai¹, Vanama Pavan Kumar¹, Chujie Zhu², Mark J MacLachlan¹, Kevin J Smith², Michael O Wolf¹

Affiliations

¹ Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
² Department of Chemical and Biological Engineering, University of British Columbia , 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada.

PMID: 29261280
DOI: 10.1021/acsami.7b13408

Abstract

Nanostructured PdO/CeO₂ supported on mesoporous SBA-15 silica was synthesized using a combination of incipient wetness impregnation and surface-assisted reduction. After calcination, the materials showed good activity as catalysts for the low-temperature oxidation of methane, with a sample having 5 wt % Pd loading showing 50% conversion to CO₂ at ∼290 °C and complete conversion below 360 °C. The stability of catalysts in the presence of water was studied. The formation of Pd(0) during the methane oxidation reaction increases the oxygen vacancies on the surface of catalysts, improving the catalytic activity.

Keywords: ceria; double deposition approach; mesoporous silica; methane oxidation; palladium oxide.