Abstract
Abstract V 2 O 5 P 2 O 5 catalysts were found to be effective for the partial oxidation of acrolein to acrylic acid. The addition of phosphorus to V 2 O 5 induces a large increase in the selectivity to acrylic acid, though it also induces a marked decrease in the oxidation activity. The best results for the formation of acrylic acid are obtained with the P/V atomic ratio = 1.2 catalyst. The selectivity to acid remains unchanged at 90 to 95 mol% up to the acrolein conversion of about 95%. More than 95 mol% of the produced acid was found to be acrylic acid. The selectivity of the P/V = 1.2 catalyst was higher than that of the MoO 3 V 2 O 5 (Mo/V atomic ratio = 4.7) catalyst. B 2 O 3 , TeO 2 , Co 3 O 4 , and ZrO 2 were added to the P/V = 1.2 system, but the selectivity was not improved. It is proposed that the phosphorus plays a role in suppressing the basic property of catalyst which contribute to the consecutive oxidation of acrylic acid. The effects of reaction variables, such as oxygen concentration, acrolein concentration, water vapor, on the activity and selectivity were also studied.
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