Method of preparing multicomponent bismuth molybdate catalysts comprising four metal components and method of preparing 1,3-butadiene using said catalysts

A method of preparing a multicomponent bismuth molybdate catalyst, comprising:

• a) preparing a first solution including a precursor of a trivalent cationic metal including iron, a precursor of a divalent cationic metal selected from the group consisting of magnesium, manganese, cobalt, nickel, copper, zinc, and a bismuth precursor;
• b) preparing a second solution, in which a molybdenum precursor is dissolved;
• c) adding the first solution in droplets to the second solution so that coprecipitation occurs, thus obtaining a coprecipitated solution;
• d) subjecting the coprecipitated solution to stirring for about 1 to about 2 hours and then dewatering, thus obtaining a solid component;
• and
• e) subjecting the solid component to drying at 150-200° C. and then thermal treatment at 400-600° C.,
• wherein the multibismuth molybdate catalyst consists of four (4) metal components of the trivalent cationic metal, the divalent cationic metal, bismuth and molybdenum;
• and
• wherein a molar ratio of the precursor of the divalent cationic metal:the precursor of the trivalent cationic metal:bismuth precursor:molybdenum precursor is about 7 to about 10:2-4:1:5-20.