Highly Durable Pt–Ru-Doped Ce_0.9Zr_0.1O₂ as an Effective Dual Catalyst for Low-Temperature Simultaneous Propane and Carbon Monoxide Oxidation

Abstract

The demand for a dual catalyst that maintains high catalytic performance at low temperatures for simultaneous propane and carbon monoxide (CO) oxidation with repeated usage is significant, yet lacking in the literature. Here, we report a mesoporous platinum–ruthenium (0.5 wt % Pt and 0.5 wt % Ru)-doped ceria–zirconia bifunctional catalyst achieving T 95 at ∼260 °C and T 100 below 300 °C for propane oxidation, along with simultaneous 100% CO conversion at ∼200 °C. The performance is maintained after accelerated aging at 1000 °C for 24 h. The consistent superior performance over prolonged cycling is multifaceted, contributed by an optimal balance among nanostructure, metal oxide support/metal dopant system, and composition. The ceria–zirconia support gives enhanced oxygen storage and release capabilities coupled with thermal endurance. The porous catalyst has numerous catalytic sites with short reaction paths doped with Pt–Ru nanoparticles, leading to increased efficiency in bond cleavage for propane and endowing CO tolerance. Nanosized particles with narrow size distribution and uniform metal dispersion are effective in promoting catalytic activity toward oxidation reactions at low temperatures. This catalyst is thermally stable, durable, and active toward propane oxidation, and its catalytic performance is not compromised by the simultaneous presence of CO.