Ni-Zn bimetallic catalysts for oxidative dehydrogenation of butane:Oxygen mobility and catalytic performance
A series of Ni-Zn bimetallic catalysts were prepared by the sol-gel method to improve the catalytic performance of NiO catalyst for oxidative dehydrogenation(ODH)of butane,and the effect of Zn contents on the ODH reaction was investigated.H2 temperature-programmed reduction(H2-TPR),temperature-programmed re-oxidation(TPRO)and X-ray photoelectron spectroscopy(XPS)were used to study the redox ability and catalytic performance of catalysts.The results revealed that the NiZn0.5 catalyst exhibited the best catalytic performance.The addition of Zn improved the oxygen mobility of the catalysts,which was reflected in the increased oxygen capacity of the catalyst and the enhanced lattice oxygen replenishment on the catalyst.NiZn0.5 catalyst had the largest oxygen capacity and the highest oxygen replenishment rate,making it easier for oxygen vacancies on the catalyst to be filled during the reaction process.In addition,the bimetallic oxide catalysts improved the coking problem of NiO catalyst.
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