Journal of Industrial and Engineering Chemistry, Vol.45, 111-120, January, 2017
Composition effect of metal species in (Ni, Fe, Co)-Bi-O/gamma-Al2O3 catalyst on oxidative dehydrogenation of n-butane to butadiene
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The effect of metal oxide species in (Ni, Fe and/or Co) oxide-Bi2O3 over gamma-alumina support was investigated for n-butane oxidative dehydrogenation. Partial substitution of Ni up to 50% by Fe improved butadiene selectivity while same substitution with Co increased n-butane conversion. The ternary Ni-Fe-Co system (10 wt% Ni-5 wt% Fe-5 wt% Co-30 wt% Bi-O/gamma-Al2O3) showed the highest butadiene selectivity of 46.3% at n-butane conversion of 30%. The acid-base sites preferably adjusted by ternary main metal combination in hierarchical cohabitation of metal (Ni, Fe and Co) oxide, Bi2O3 and gamma-Al2O3 cooperate to accelerate butadiene selectivity at both 1st and 2nd step dehydrogenations due to an increased H2 abstraction and 1-butene intermediate adsorption.
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