US 12,076,709 B2
Method for producing a catalyst for oxidative dehydrogenation of butene
Ara Cho, Daejeon (KR); Young Chang Byun, Daejeon (KR); Gyo Hyun Hwang, Daejeon (KR); Jungup Bang, Daejeon (KR); and Cheolock Song, Daejeon (KR)
Assigned to LG CHEM, LTD., Seoul (KR)
Filed by LG CHEM, LTD., Seoul (KR)
Filed on Apr. 13, 2023, as Appl. No. 18/134,487.
Application 18/134,487 is a division of application No. 16/756,561, granted, now 11,648,536, previously published as PCT/KR2018/014726, filed on Nov. 27, 2018.
Claims priority of application No. 10-2017-0160634 (KR), filed on Nov. 28, 2017.
Prior Publication US 2023/0271169 A1, Aug. 31, 2023
Int. Cl. B01J 23/887 (2006.01); B01J 35/40 (2024.01); B01J 37/00 (2006.01); B01J 37/03 (2006.01); C07C 5/48 (2006.01); C07C 11/167 (2006.01)
CPC B01J 23/8876 (2013.01) [B01J 35/40 (2024.01); B01J 37/0036 (2013.01); B01J 37/009 (2013.01); B01J 37/03 (2013.01); C07C 5/48 (2013.01); C07C 11/167 (2013.01)] 3 Claims
OG exemplary drawing
 
1. 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).