To provide a method of efficiently decomposing a nitrogen oxide by removing a strongly-acidic compound poisoning a noble metal catalyst prior to decomposing the nitrogen oxide in exhaust gas in which the strongly-acidic compound and the nitrogen oxide coexist and which is generated in the manufacture process of a nitrogen-containing organic compound including the introduction process of a nitrogen atom to a hydrocarbon compound or the like, using the noble metal catalyst.
In the method of decomposing the nitrogen oxide in the exhaust gas containing the strongly-acidic compound using the noble metal catalyst, before the decomposition treatment, the strongly-acidic compound is removed or reduced by bringing it into contact with metal oxide, metal hydroxide, ammonia, amines, or salt which has the acid radical of an acid compound of weaker acidity than the strongly-acidic compound and is stable in the air.
CHAEN SHIGEHIRO
ISONO TAKU
Atsushi Hayashi