Oxidative Dehydrogenation of n-Butenes to 1,3-Butadiene over Ni- BiOx Metal Oxides Supported on Mesoporous SBA-15

A Ni-BiOx/SBA-15 catalyst synthesized using a co-impregnation method was utilized for the oxidative dehydrogenation (ODH) of n-butenes (1butene and 2-butene) to 1,3-butadiene in a fixed-bed reactor. The layered structure of NiO/beta-Bi2O3/Bi2SiO5/SBA-15 was confirmed using porosity, XRD, and H2-TPR measurements. The components of the structure interacted moderately to form an effectively active and selective NiO species as an ODH catalyst. Thermodynamic analysis results revealed the most favorable pathway for butene conversion; however, this catalyst kinetically favored the desired and efficient route of butene conversion via adsorption of butenes, abstraction of alpha- hydrogen, and the formation of highly selective 1,3-butadiene. The selectivity of the oxygen species in the metal oxide system along the efficient route was sustained by co-feeding gas phase oxygen and increasing the reaction temperature. The catalyst comprising 14 wt % Ni-10 wt % Bi-O/SBA-15 exhibited a 2-butene conversion of 83% and a 1,3-butadiene selectivity of 89% at 400 degrees C and O2/C4= ratio = 4.0 mol/mol.

Automated summary

A Ni-BiOx/SBA-15 catalyst synthesized using a co-impregnation method was used for the oxidative dehydrogenation of n-butenes to 1,3-butadiene. The catalyst had a layered structure and formed an active and selective NiO species. The desired route for butene conversion was achieved through adsorption, hydrogen abstraction, and selective formation of 1,3-butadiene. The catalyst exhibited high conversion and selectivity at specific reaction conditions.