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Enhanced catalytic activity of H2O2 treated-PdO/θ-Al2O3 catalysts in methane oxidation

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Abstract

Herein, the effect of H2O2 treatment on the catalytic activity of a PdO-based catalyst for methane oxidation was investigated. The H2O2-treated catalysts were prepared from as-made PdO/θ-Al2O3 (PdO/Al2O3(A-H2O2)) or calcined (PdO/Al2O3(C-H2O2)). Both H2O2-treated catalysts exhibited better catalytic activity in the absence or presence of water vapor than the PdO/θ-Al2O3 catalyst. The light-off temperatures (T50%) in the dry conditions increased in the following order: PdO/Al2O3(A-H2O2) < PdO/Al2O3(C-H2O2) < PdO/Al2O3. In the presence of water vapor, the T50% value shifted to higher temperatures compared with its value under dry conditions because of hydroxyl accumulation caused by water vapor produced during the reaction. In addition, the PdO/Al2O3(A-H2O2) catalyst exhibited the best activity for methane isothermal oxidation. This enhancement was attributed to the facile reduction of PdO species, facile desorption of adsorbed methane species, high surface exposure of PdO, and strong acid site formation caused by H2O2 treatment.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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  1. Technical Process Team, Taekwang Industrial Co. Ltd., Ulsan, 44785, South Korea

    Jung-Hyun Park

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  1. Jung-Hyun Park
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Correspondence to Jung-Hyun Park.

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Park, JH. Enhanced catalytic activity of H2O2 treated-PdO/θ-Al2O3 catalysts in methane oxidation. Reac Kinet Mech Cat 135, 2945–2958 (2022). https://doi.org/10.1007/s11144-022-02296-6

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