Recent progress on the bismuth molybdate catalysts for oxidative dehydrogenation of n-butene to 1, 3-butadiene was reported in this review. A number of bismuth molybdate catalysts, including pure bismuth molybdates (a-
Oxidative dehydrogenation of C 4 raffinate-3 to 1,3-butadiene was carried out in a dual-bed reaction system comprising ZnFe 2 O 4 and Co 9 Fe 3 Bi 1 Mo 12 O 51 catalysts in order to investigate a synergistic effect of these two catalysts. Conversion of n-butene and yield for 1,3-butiadene obtained in a dual-bed reaction system comprising ZnFe 2 O 4 (first-bed) and Co 9 Fe 3 Bi 1 Mo 12 O 51 (second-bed) were higher than those obtained in a single-bed reaction system using either ZnFe 2 O 4 or Co 9 Fe 3 Bi 1 Mo 12 O 51 . 1-Butene-TPD and 2-butene-TPD measurements revealed that ZnFe 2 O 4 catalyst retained more selective oxygen species for the reaction with 2-butene than for the reaction with 1-butene, while Co 9 Fe 3 Bi 1 Mo 12 O 51 catalyst retained more selective oxygen species for the reaction with 1-butene than for the reaction with 2-butene. The synergistic effect of ZnFe 2 O 4 (first-bed) and Co 9 Fe 3 Bi 1 Mo 12 O 51 (second-bed) catalysts in the oxidative dehydrogenation of C 4 raffinate-3 was attributed to the combination of high catalytic activity of ZnFe 2 O 4 for 2-butene and high catalytic activity of Co 9 Fe 3 Bi 1 Mo 12 O 51 for 1-butene.
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