Bismuth molybdate-based catalyst having zeolite coating layer, method of preparing the same, and method of preparing 1,3-butadiene using the same

A method of preparing a bismuth molybdate-based composite oxide catalyst for preparing 1,3-butadiene, the catalyst including a zeolite coating layer having micropores on the surface thereof, the method comprising:

• 1) preparing a bismuth molybdate-based composite oxide expressed by Formula 1 below;
• 2) pouring a zeolite seed solution to the prepared bismuth composite oxide into and leaving the bismuth composite oxide as it is, then drying and firing the bismuth composite oxide to form zeolite seeds on the surface of the bismuth molybdate composite oxide;
• and
• 3) impregnating, into a zeolite synthesizing solution, the bismuth molybdate composite oxide with the zeolite seeds formed, to allow the seeds to grow, and then drying the bismuth molybdate composite oxide:
• MoaBibFecCodEeOy [Formula 1]
• where, E is at least one selected from the group consisting of nickel, sodium, potassium, rubidium, and cesium;
• the a, b, c, d and e each is 0.001 to 1;
• and
• the y is a value determined to adjust a valence by other element.