US 12,090,467 B2
Catalyst for catalytic reduction of industrial flue gas SO2 with CO to prepare sulfur, method for preparing same and use thereof
Haitao Xu, Nanjing (CN); Wenyu Ji, Nanjing (CN); Mutao Xu, Nanjing (CN); Qijie Jin, Nanjing (CN); Mingbo Li, Nanjing (CN); Jing Song, Nanjing (CN); and Meng Xu, Nanjing (CN)
Assigned to NANJING TECH UNIVERSITY, Nanjing (CN); and NANJING GEKOF INSTITUTE OF ENVIRONMENTAL PROTECTION TECHNOLOGY & EQUIPMENT CO., LTD., Nanjing (CN)
Filed by NANJING TECH UNIVERSITY, Jiangsu (CN); and NANJING GEKOF INSTITUTE OF ENVIRONMENTAL PROTECTION TECHNOLOGY & EQUIPMENT CO., LTD., Jiangsu (CN)
Filed on Jul. 7, 2022, as Appl. No. 17/859,111.
Claims priority of application No. 202110870394.6 (CN), filed on Jul. 30, 2021.
Prior Publication US 2023/0043657 A1, Feb. 9, 2023
Int. Cl. B01J 37/03 (2006.01); B01D 8/00 (2006.01); B01D 53/86 (2006.01); B01J 23/10 (2006.01); B01J 35/00 (2024.01); B01J 35/23 (2024.01); B01J 37/00 (2006.01); B01J 37/02 (2006.01); B01J 37/04 (2006.01); B01J 37/08 (2006.01); B01J 37/20 (2006.01); C01B 17/04 (2006.01)
CPC B01J 23/10 (2013.01) [B01D 8/00 (2013.01); B01D 53/8609 (2013.01); B01J 35/23 (2024.01); B01J 37/0036 (2013.01); B01J 37/009 (2013.01); B01J 37/0221 (2013.01); B01J 37/0236 (2013.01); B01J 37/031 (2013.01); B01J 37/04 (2013.01); B01J 37/08 (2013.01); B01J 37/20 (2013.01); C01B 17/0486 (2013.01); B01D 2255/2061 (2013.01); B01D 2255/2063 (2013.01)] 14 Claims
 
1. A method for preparing a catalyst for catalytic reduction of an industrial flue gas SO2 with CO, comprising the following steps:
a) respectively dissolving Ce(NO3)3·6H2O and NaOH in water to obtain a Ce(NO3)3·6H2O aqueous solution and a NaOH aqueous solution, and slowly adding the NaOH aqueous solution dropwise into the Ce(NO3)3·6H2O aqueous solution for uniform mixing to obtain a mixed solution 1;
b) dissolving cetyl trimethyl ammonium bromide (CTAB) and sodium dodecyl sulfonate (SDS) in water to obtain a solution, slowly adding the solution into the mixed solution 1 for stirring for 12-15 h, and conducting a hydrothermal reaction at a temperature of 100-110° C. for 24-26 h;
c) cooling a reactant obtained after the hydrothermal reaction in step b) to room temperature, filtering the cooled reactant to collect a white precipitate, and sequentially washing, drying and calcining the white precipitate to obtain a CeO2 nanorod;
d) dissolving La(NO3)3·6H2O and Y(NO3)3·6H2O in water to obtain a mixed solution 2, and adjusting a pH of the mixed solution 2 to 12; adding the CeO2 nanorod obtained in step c) into the mixed solution 2, placing the mixed solution 2 on a magnetic stirrer for stirring at a constant speed at 30-40° C. for about 4-6 h, heating the mixed solution to 80-90° C., and continuously stirring the mixed solution until the solution is neutral to obtain a catalyst; and drying the catalyst, and calcining the dried catalyst in an air atmosphere in a muffle furnace at 500-600° C. for 4-6 h to obtain a La-Y/CeO2 catalyst; and
e) pulverizing and sieving the La-Y/CeO2 catalyst, placing particles with a particle size of 60-80 mesh in a quartz tube, and placing the quartz tube in an electric tube furnace; and then conducting sulfurization at 550-600° C. at a heating rate of 5-15° C./min in a mixed gas comprising 1-10% of CO, 1-10% of SO2 and the balance of N2 by volume at an air speed of 5,000-8,000 h−1 for 1-4 h to obtain a target product sulfurized catalyst.