Polybasic organic acids controlled synthesis of Mo-V-O composite metal oxide for the catalytic conversion of glycerol

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By introducing oxalic acid, succinic acid, and tartaric acid into the synthesis process of Mo-V-O composite metal oxides, the structure directing effect of polybasic organic acids on the crystal structure of Mo-V-O compositee metal oxide was studied. Moreover, the prepared Mo-V-O samples with different crystal phase compositions were used to the conversion of glycerol, and the effect of crystal phase structure on its catalytic performance was investigated. Results show that the crystal phase structure of Mo-V-O can be regulated by changing the type and additive amount of polybasic organic acids. The crystal phase of Mo-V-O changed from MoV2O8 to Mo0.97V0.95O5 with the increase of succinic acid and tartaric acid. The change in the Mo-V-O crystal phase is related to the amount of organic acid and the carbon chain length. When the crystal phase is MoV2O8, the selectivity of acrolein and acetone is 25.7 % and 16.2 %. According to the XPS results, Mo6+ in MoV2O8 promoted the formation of acrolein, while Mo5+ in Mo0.97V0.95O5 promoted the formation of acetone. So when the crystal phase is Mo0.97V0.95O5, the selectivity of acrolein and acetone is 11.9 % and 24.6 %. Therefore, the results of catalyzing glycerol can be controlled by selecting different crystal phases.

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