Tuning Pt-TiO<sub>2</sub> Interactions to Switch Inhibition to Synergy in Toluene–Acetone Mixture Combustion
Yuqin Lu, Hua Deng, X. C. Zhang, Jianguo Ding, Sijia Bai, Lian Wang, Hong He
Abstract
The inhibitory interactions among various volatile organic compounds (VOCs) during combustion in industrial exhaust gases pose a significant challenge for catalytic technologies, primarily due to a lack of effective approaches to counter these adverse effects. The interaction between Pt and TiO 2 was readily tuned through hydrogen reduction of the TiO 2 matrix (Pt/TiO 2 -800), which ultimately transformed the inhibitory effect into a synergistic effect in a toluene–acetone mixture. Optimal catalytic activity was achieved at 0.6 wt % Pt loading, with 0.6Pt/TiO 2 -800 lowering reaction temperatures by 21 °C for toluene and 24 °C for acetone in mixed VOC oxidation. Characterization reveals that Pt/TiO 2 -800 possesses abundant oxygen vacancy clusters, enhancing TiO 2 -Pt electron transfer, diversifying Pt nanoparticle sizes, stabilizing low-valent Pt species, and improving oxidative capacity. DFT calculations further underscore the role of oxygen vacancy in modulating the Pt electronic environment and enhancing defect-enhanced adsorption. This work advances Pt-TiO 2 interaction understanding and offers an effective catalyst for VOCs abatement, addressing inhibitory effects in mixed VOCs systems.