Methane conversion and SO2 resistance of LaMn1−xFexO3 (x = 0.4, 0.5, 0.6, 1) perovskite catalysts promoted with palladium

Lanthanum perovskites were synthesized by malic acid complexation and different amounts of palladium were added by dry-wet impregnation. Measurements of methane conversion on fresh and SO2-treated perovskite catalysts were made between 25 and 500 °C. Methane conversion on fresh catalysts commenced at ∼300 °C, and the best activities were achieved with low loadings of palladium. The B-site metal combinations Mn0.4Fe0.6 and Mn0.6Fe0.4 showed better conversion activity than Mn0.5Fe0.5 and Fe. All fresh perovskite catalysts except those with 10% Pd gave 100% conversion of methane at 500 °C. The resistance of 10% Pd perovskite catalysts to sulfur was generally better than that of catalysts with low Pd loadings. This was due to the high Pd coverage on the perovskite surface. Fresh and SO2-treated LaMn0.4Fe0.6O3 perovskite catalysts promoted with 2 and 2.5% of palladium exhibited the highest activities for methane conversion.

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