Abstract
A series of Ni 9 Fe 3 Bi 1 Mo 12 O 51 catalysts were prepared by a co-precipitation method with a variation of pH value (pH 3–9), and were applied to the oxidative dehydrogenation of n -butene to 1,3-butadiene in a continuous flow fixed-bed reactor. O 2 -temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) measurements were carried out to determine the oxygen mobility of Ni 9 Fe 3 Bi 1 Mo 12 O 51 catalysts. It was revealed that the catalytic performance of Ni 9 Fe 3 Bi 1 Mo 12 O 51 was closely related to the oxygen mobility of the catalysts. The yield for 1,3-butadiene was monotonically increased with increasing oxygen mobility of Ni 9 Fe 3 Bi 1 Mo 12 O 51 catalysts. Among the catalysts tested, the Ni 9 Fe 3 Bi 1 Mo 12 O 51 catalyst prepared at pH 8 showed the best catalytic performance due to its facile oxygen mobility. Thus, oxygen mobility played a key role in determining the catalytic performance of Ni 9 Fe 3 Bi 1 Mo 12 O 51 catalysts in the oxidative dehydrogenation of n -butene.
Published Version
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