Pt Nanoparticles Supported on a Mesoporous (La,Sr)(Ti,Fe)O_3−δ Solid Solution for the Catalytic Oxidation of CO and CH₄

The synthesis of a mesoporous (La,Sr)­(Ti,Fe)­O_3−δ (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.