Catalyst for catalytic reduction of industrial flue gas SO2 with CO to prepare sulfur, method for preparing same and use thereof

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.