Pt–Pd bimetallic nanoparticles anchored on uniform mesoporous MnO2 sphere as an advanced nanocatalyst for highly efficient toluene oxidation

Improving catalytic performance is a yet still challenge in thermal catalytic oxidation. Herein, uniform mesoporous MnO 2 nanosphere-supported bimetallic Pt–Pd nanoparticles were successfully fabricated via a SiO 2 template strategy for the total catalytic degradation of volatile organic compounds at low temperature. The introduction of mesopores into the MnO 2 support induces a large specific surface area and pore size, thus providing numerous accessible active sites and enhanced diffusion properties. Moreover, the addition of a secondary noble metal can adjust the O ads /O latt molar ratios, resulting in high catalytic activity. Among them, the catalyst having a Pt/Pd molar ratio of 7:3 exhibits optimized catalytic activity at a weight hourly space velocity of 36,000 mL g −1  h −1 , reaching 100% toluene oxidation at 175 °C with a lower activation energy (57.0 kJ mol −1 ) than the corresponding monometallic Pt or non-Pt-based catalysts (93.8 kJ mol −1 and 214.2 kJ mol −1 ). Our findings demonstrate that the uniform mesoporous MnO 2 nanosphere-supported bimetallic Pt–Pd nanoparticles catalyst is an effective candidate for application in elimination of toluene.