Method for producing a catalyst for oxidative dehydrogenation of butene

A method for producing a catalyst for oxidative dehydrogenation of butene comprising:

• producing a first coprecipitate by mixing a first aqueous solution containing a cobalt salt, a salt of at least one of Fe, Mn and Cu, a salt of at least one of K and Cs, and a salt of cobalt with a second aqueous solution containing ammonium molybdate, and performing co-precipitation while stirring at 30° C. to 50° C. for 0.5 to 2 hours;
• producing a second coprecipitate by mixing a third aqueous solution of bismuth (Bi) with a fourth aqueous solution containing ammonium molybdate, and performing co-precipitation while stirring at 30° C. to 50° C. for 0.5 to 2 hours;
• and
• aging the second coprecipitate;
• and
• mixing the first coprecipitate and the second coprecipitate to form a slurry;
• drying the slurry;
• grinding and calcining the dried slurry to produce catalyst particles, wherein a surface composition of the catalyst particles, measured by X-ray photoelectron spectroscopy (XPS), has a molar content of bismuth (Bi) that is higher than a molar content of cobalt (Co), a composition according to Composition Formula 1;
• MoaBibCoc(M1)d(M4)eOf [Composition Formula 1]
• in Composition Formula 1, Mo is molybdenum, Bi is bismuth, Co is cobalt, O is oxygen,
• M1 is one or more of potassium (K) and cesium (Cs),
• M4 is one or more of iron (Fe), manganese (Mn), and copper (Cu),
• a is from 9 to 25, b is from 0.5 to 2, c is from 1 to 10, d is from 0.01 to 1, e is from 0.5 to 5, and
• f is from 30 to 50,
• wherein the catalyst satisfies the following Calculation Formula 1
• BARS/BART>6, [Calculation Formula 1]
• in Calculation Formula 1
• BARS is the molar content of bismuth/the molar content of cobalt on the catalyst surface, measured by XPS, and
• BART is a molar content of bismuth/a molar content of cobalt in the entire catalyst, measured by inductively coupled plasma optical emission spectroscopy (ICP-OES).