Generation of syngas through autothermal partial oxidation of glycerol over LaMnO3- and LaNiO3-coated monoliths

•Glycerol autothermal partial oxidation over LaMnO3 and LaNiO3 perovskites.•LaMnO3 promotes glycerol combustion to carbon dioxide and water.•LaNiO3 enhances glycerol partial oxidation to syngas.•LaNiO3 is more active in steam reforming and water-gas shift than LaMnO3.•LaMnO3 has better stability than LaNiO3.

This study presents a side-by-side comparison of LaMnO3 and LaNiO3 perovskites in the autothermal partial oxidation of glycerol to syngas. Pure glycerol and glycerol/water solutions were converted to syngas under adiabatic conditions. The addition of water suppressed glycerol conversion and reaction temperature, but increased H2 selectivity with the appropriate steam-to-glycerol feed ratio. Catalytic results show that LaMnO3 is more active than LaNiO3 in autothermal partial oxidation because of its combustion-prone nature. In contrast, LaNiO3 produced higher H2 selectivity than LaMnO3 did. A comparative study of LaMnO3 and LaNiO3 in glycerol steam reforming and water-gas shift was performed as well to reveal how these H2-production reactions proceed in the oxygen-deficient regime of a catalyst bed. The outcomes indicate that LaNiO3 is more active than LaMnO3 in these two reactions, thereby enhancing H2 selectivity in a partial oxidation system. Moreover, a 24-h lifetime test of these two perovskites was conducted, showing that LaMnO3 has greater durability.

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