| abstract |
PROBLEM TO BE SOLVED: To use a catalyst having excellent selective removal activity for nitrogen oxides and good toxicity for sulfur oxides at a high temperature and a waste catalyst discharged in a hydrodesulfurization process of an oil refinery. Provided is a method for producing a catalyst for selective catalytic reduction of nitrogen oxides at a high temperature. SOLUTION: A pretreatment step in which a spent catalyst is heat-treated and then washed with water, a step of preparing titania supporting 3 to 10% by weight of tungsten, a step of pulverizing the spent catalyst, and uniformly mixing with the tungsten-supported titania; Dehydrating the mixture to remove excess water and active metal components, Drying the dehydrated mixture at 100 to 200 ° C. for 9 hours or more, crushing the mixture, extruding the crushed mixture, or coating the structure on a structure, followed by drying at a constant temperature and humidity; A method for producing a catalyst for selective catalytic reduction of nitrogen oxides at a high temperature comprising a step of forming a catalyst by calcining the dried structure, and a catalyst produced by the method. |