Thermal-Driven Optimization of the Strong Metal-Support Interaction of a Platinum-Manganese Oxide Octahedral Molecular Sieve to Promote Toluene Oxidation: Effect of the Interface Pt2+-Ov-Mnδ+

Strong metal-support interactions (SMSIs) have a significant effect on the performance of supported noble-metal catalysts for volatile organic compound (VOC) elimination. Herein, the strength of the SMSI of Pt/OMS-2 between Pt and the OMS-2 support is regulated by simply changing calcination temperatures, and the catalyst calcined at 300 degrees C (Pt/OMS-2-300) performs the best in the catalytic combustion of toluene. Through systematic structural characterizations, it is revealed that much more Pt2+-O-v-Mn delta+ species are formed in Pt/OMS-2-300, which can help facilitate the generation of more reactive oxygen species and promote lattice oxygen mobility. Moreover, the results of in situ DRIFTS experiments further confirm that abundant Pt2+-O-v-Mn delta+ species at the Pt-MnO2 interface on Pt/OMS-2-300 can better enhance the adsorption and activation of toluene, thus boosting the catalytic performance in toluene combustion. This newly developed strategy of thermal-driven regulation of the SMSI provides a novel perspective for constructing highly efficient catalysts for VOC emission control.

Automated summary

The strength of the strong metal-support interactions (SMSIs) between Pt and the OMS-2 support in Pt/OMS-2 catalyst can be regulated by changing calcination temperatures. The catalyst calcined at 300 degrees C (Pt/OMS-2-300) shows the best performance in catalytic combustion of toluene. The abundant Pt2+-O-v-Mn delta+ species at the Pt-MnO2 interface in Pt/OMS-2-300 can enhance the adsorption and activation of toluene, promoting its catalytic performance.