Oxidative dehydrogenation of n-butene to 1,3-butadiene over multicomponent bismuth molybdate (M~(II)_9Fe3Bi1Mo_(12)O_(51)) catalysts: Effect of divalent metal (M~(II))

摘要

Multicomponent bismuth molybdate (M~(II)_9Fe3Bi1Mo_(12)O_(51)) catalysts with different divalent metal (M~(II) = Mg, Mn, Co, Ni, and Zn) were prepared by a co-precipitation method, and were applied to the oxidative dehydrogenation of n-butene to 1,3-butadiene. Effect of divalent metal (M~(II)) on the catalytic performance of M~(II)_9Fe3Bi1Mo_(12)O_(51), catalysts was investigated. X-ray photoelectron spectroscopy (XPS) measurements were conducted to determine the oxygen mobility of M~(II)_9Fe3Bi1Mo_(12)O_(51) catalysts. It was found that the catalytic performance of M~(II)_9Fe3Bi1Mo_(12)O_(51) catalysts was closely related to the oxygen mobility of the catalysts. The yield for 1,3-butadiene was monotonically increased with increasing oxygen mobility of the catalysts. Among the catalysts tested, the Co9Fe3Bi1Mo_(12)O_(51) catalyst with the highest oxygen mobility showed the best catalytic performance in the oxidative dehydrogenation of n-butene.