Catalytic Partial Oxidation of Propylene to Acrolein: The Activity of Bismuth Molybdate Catalysts under Oxygen-Rich Conditions

摘要

The effect of Bi/Mo ratio, which varied between 1:3 and 2:1, on the activity of bismuth molybdate catalysts prepared by precipitation method for partial oxidation of propylene has been investigated. X-ray diffraction analysis revealed that the catalysts contained a mixture of α-Bi_2Mo_3O_(12) and molybdite (MoO_3) for Bi/Mo = 1:3, pure α-Bi_2Mo_3O_(12) for Bi/Mo = 2:3, a mixture of β-Bi_2Mo_2O_9 and α-Bi_2Mo_3O_(12) for Bi/Mo = 1:1, and pure γ-Bi_2MoO_6 for Bi/Mo = 2:1. The catalytic activity tests show that the catalysts achieved up to 56% conversion of C_3H_6 with up to 91% selectivity towards C_3H_4O production. The relative reactivity of the catalysts follow the order of Bi/Mo 2:3 ≈ Bi/Mo 2:1 > Bi/Mo 1:3 > Bi/Mo 1:1.