Fabricating Uniform TiO2-CeO2 Solid Solution Supported Pd Catalysts by an In Situ Capture Strategy for Low-Temperature CO Oxidation

Huimin Liu; Shipeng Wu; Chao Sun; Zhen Huang; Hualong Xu; Wei Shen

doi:10.1021/acsami.2c23248

Fabricating Uniform TiO₂-CeO₂ Solid Solution Supported Pd Catalysts by an In Situ Capture Strategy for Low-Temperature CO Oxidation

ACS Appl Mater Interfaces. 2023 Mar 1;15(8):10795-10802. doi: 10.1021/acsami.2c23248. Epub 2023 Feb 16.

Authors

Huimin Liu¹, Shipeng Wu¹, Chao Sun¹, Zhen Huang¹, Hualong Xu¹, Wei Shen¹

Affiliation

¹ Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Laboratory of Advanced Materials, Collaborative Innovation Centre of Chemistry for Energy Materials, Fudan University, Shanghai 200433, China.

PMID: 36795527
DOI: 10.1021/acsami.2c23248

Abstract

Support properties regulation has been a feasible method for the improvement of noble metal catalytic performance. For Pd-based catalysts, TiO₂-CeO₂ material has been widely used as an important support. However, due to the considerable discrepancy in the solubility product constant between titanium and cerium hydroxides, it is still challenging to synthesize a uniform TiO₂-CeO₂ solid solution in the catalysts. Herein, an in situ capture strategy was constructed to fabricate a uniform TiO₂-CeO₂ solid solution as supports for an enhanced Pd-based catalyst. The obtained Pd/TiO₂-CeO₂-iC catalyst possessed enriched reactive oxygen species and optimized CO adsorption capability, manifesting a superior CO oxidation activity (T₁₀₀ = 70 °C) and stability (over 170 h). We believe this work provides a viable strategy for precise characteristic modulation of composite oxide supports during the fabrication of advanced noble metal-based catalysts.

Keywords: CO oxidation; Pd catalysts; enriched reactive oxygen species; in situ capture strategy; uniform TiO2−CeO2 solid solution.