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⁺–O_v–Mn^δ+

Abstract

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 °C (Pt/OMS-2-300) performs the best in the catalytic combustion of toluene. Through systematic structural characterizations, it is revealed that much more Pt 2+ −O v −Mn δ+ 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 Pt 2+ −O v − Mn δ+ species at the Pt−MnO 2 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.

Size Effect of Platinum Nanoparticles over Platinum–Manganese Oxide on the Low-Temperature Oxidation of Toluene

“…The Pt/OMS-2 catalysts were prepared in two steps . The detailed description is presented in the Supporting Information.…”

“…Yan et al obtained a Pt/TiO 2 –C catalyst with a Ti δ+ –Vo • –Pt δ+ interface structure, which accelerated the preactivation of toluene to generate a large number of reactive intermediates for photocatalytic reactions. In our previous work, Pt 2+ –Vo–Mn δ+ species was the major active site for the oxidation of toluene . Thus, the formation of SSOV structures could facilitate catalytic reactions.…”

“…In our previous work, Pt 2+ −Vo−Mn δ+ species was the major active site for the oxidation of toluene. 26 Thus, the formation of SSOV structures could facilitate catalytic reactions.…”

Preformed Pt Nanoparticles Supported on Nanoshaped CeO2 for Total Propane Oxidation

“…The emissions of volatile organic compounds (VOCs) from mobile and stationary sources have raised concerns due to their hazardous effect on the environment and human health. − Propane is widely regarded as one of the most representative VOCs due to its stable chemical nature and high bonding energy. − …”

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

“…14 Compared to catalysts based on Pd, 15 Au, 16 Ag, 17 and Ru, 18 Pt catalysts are more commonly adopted due to their favorable properties for oxygen activation and C−H bond cleavage. 19,20 Numerous strategies have been explored to optimize the catalytic oxidation performance of VOCs over supported Pt catalysts. 21 For instance, Chen et al 22 investigated the impact of Pt nanoparticle sizes using ZSM-5 as a carrier.…”