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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