Patent ID: 8367885

Claim:
A method of preparing 1,3-butadiene, comprising: a) packing a multicomponent bismuth molybdate catalyst consisting of Bi, Ni, Fe and Mo as metal components in a fixed bed of a reactor; b) performing oxidative dehydrogenation while continuously passing a C4 raffinate-3 comprising n-butene and n-butane, air, and steam, as reactants, through a catalyst bed of the reactor, the C4 raffinate-3containing at least 20 wt % of n-butane; and c) obtaining 1,3-butadiene, wherein the multicomponent bismuth molybdate catalyst is prepared by the following steps comprising: a) preparing a first solution containing a Ni precursor, a Fe precursor, and a Bi precursor; b) preparing a second solution in which a Mo precursor is dissolved; c) coprecipitating the precursors of Bi, Ni, Fe, and Mo by adding the first solution to the second solution to obtain a coprecipitation solution while adding a 1-3 M alkaline solution in droplets thereto such that a pH of the coprecipitation solution is adjusted to 7-8; d) stirring the coprecipitation solution having the adjusted pH for 1-2 hours, and removing water therefrom, thus obtaining a solid component; and e) drying the solid component at 20-300° C., and then performing thermal treatment at 400-600° C., and wherein a conversion of n-butene is equal or higher than 60.3%, a selectivity for 1,3-butadiene is equal or higher than 90.8% and a 1,3-butadiene yield is equal or higher than 54.9%.