Pt Nanoparticles Supported on a Mesoporous (La,Sr)(Ti,Fe)O3-delta Solid Solution for the Catalytic Oxidation of CO and CH4

The synthesis of a mesoporous (La,Sr)(Ti,Fe)O3-? (LSTF) solid solution and its application as a catalytic support is presented. A mesoporous nanostructured perovskite solid solution with a tunable specific surface area and pore volume of up to 201 m2 g-1 and 0.411 cm3 g-1, respectively, was obtained by a sol-gel-like SiO2 endotemplating approach. Very high porosity combined with the redox-active characteristics of the perovskite structure makes these systems effective supports for Pt nanoparticle (NP) catalysts. As a result, when 0.8 wt % Pt NPs was introduced, the mesoporous LSTF showed improved CO and CH4 oxidation rates compared to commercially available SiO2 or CeO2. These observations demonstrate the promotional effects between Pt and LSTF and suggest an efficient strategy for achieving active support materials toward oxidation catalysis.