| Summary: | Ventilation air methane (VAM) is the main cause of greenhouse gas emissions in coal mining. Catalytic flow reverse reactor (CFRR) is widely used in VAM to mitigate methane emissions. In this study, palladium (Pd) and La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> were used as catalysts in a CFRR. Different types of catalysts were prepared by loading La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3</sub>, La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub>, and 0.1%Pd-La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> on a cordierite honeycomb reactor coated with γ-Al<sub>2</sub>O<sub>3</sub> to compare their performances. In addition, this study compared the performance of the three catalysts in an 800 °C reactor based on different methane inlet concentrations, inlet speeds, and conversion times. The results showed: (1) 0.1% addition of Pd increased methane conversion. (2) La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3</sub> had higher efficiency at lower methane inlet concentrations, whereas La<sub>0.9</sub>Sr<sub>0.1</sub>MnO<sub>3</sub> was more efficient at higher methane concentrations. This study demonstrates that a higher Sr loading is worth implementing only when the methane concentration of VAM is lower than 0.6%. (3) To achieve a higher methane conversion efficiency, the inlet velocity of methane should also be considered.
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