| abstract |
A denitration method by selective reduction of nitrogen oxides in low-temperature automobile exhaust gas such as exhaust gas emitted from a diesel engine automobile, an ammonia production method used in the denitration method, and a urea hydrolysis catalyst used in the ammonia production method provide. SOLUTION: A structure in which urea water is made mist with a pressurized gas or kept in an aqueous solution while tungsten oxide is added to a titanium oxide support, or tungsten oxide is added to a titanium oxide support, and Solid urea is contacted with a urea hydrolysis catalyst having a structure supporting vanadium oxide in a temperature range of 130 to 200 ° C. to hydrolyze urea to continuously generate ammonia. [Selection figure] None |