Abstract
The vapor-phase aldol condensation between formaldehyde and acetone was studied using various kinds of single and binary metal oxides and heteropoly compounds as the catalysts. It was found that the possession of both acidic and basic properties is favorable to promote the reaction and that methyl vinyl ketone is almost the sole product over the acidic catalysts, while a marked amount of by-products is formed over the relatively basic oxides. The best results were obtained with the V 2O 5P 2O 5 ( P V atomic ratio = 1.06 ) and Fe 2O 3P 2O 5 ( P Fe = 4 6 ) catalysts. The effects of the reaction variables and the stability of catalyst were also studied with the V 2O 5P 2O 5 catalyst.
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