Abstract
Construction of efficient and stable catalytic combustion materials for the removal of unburnt methane (CH4) is very critical for both applied environmental catalysis and basic materials research. Herein, a facile hydrothermal approach is designed for the fabrication of Ir/UTZX (Ir/TiO2–ZrO2) catalysts. The as-synthesized Ir/UTZX catalysts possess unique sphere morphology as well as electronic structure, leading to enlarged exposure of catalytic sites and enhancement of redox properties. As a result, the representative Ir/UTZ5 catalyst achieves a CH4 conversion of nearly 100% at 425 °C. Significantly, Ir/UTZ5 displays high long-term stability, with no obvious decrease of catalytic activity in the run of 120 h, which is much higher than those of Ir/TiO2 and Ir/ZrO2 catalysts. Our findings offer insights for designing highly efficient and stable catalysts for CH4 catalytic combustion.
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