| Summary: | The development of efficient Pt-supported zeolite catalysts with tunable micro/mesopore structures for the removal of volatile organic compounds (VOCs) presents a major challenge. Herein, hierarchical Pt/Y zeolites with tunable mesopores are fabricated by varying the etching time before the surfactant-templated crystal rearrangement method and used as catalyst supports for VOC oxidation. The hierarchical Pt/Y zeolites provided an excellent environment for Pt nanoparticle loading with abundant accessible acidic sites. The catalytic performance of the obtained hierarchical Pt/Y zeolites is analyzed using toluene oxidation, with the modified zeolites exhibiting improved catalytic activities. The hierarchical Pt/Y zeolites exhibited higher catalytic toluene oxidation activities than non-hierarchical Pt/Y zeolites. Pt/Y-6h demonstrated the highest catalytic toluene oxidation activity of the prepared catalysts, with a T<sub>90</sub> of 149 °C, reaction rate of 1.15 × 10<sup>−7</sup> mol g<sub>cat</sub><sup>−1</sup> s<sup>−1</sup>, turnover frequency of 1.20 × 10<sup>−2</sup> s<sup>−1</sup>, and an apparent activation energy of 66.5 kJ mol<sup>−1</sup> at 60,000 mL g<sup>−1</sup> h<sup>−1</sup> at a toluene concentration of 1000 ppm. This study will facilitate the fine-tuning of hierarchically porous materials to improve material properties and achieve higher catalytic performance toward VOC oxidation.
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