摘要:
Disclosed herein is a method of removing the nitrogen oxides from the gases containing nitrogen oxides by contacting any such gas with ammonia at a temperature of from 100.degree. C. to 230.degree. C. in the presence of a catalyst so that a reaction takes place between the nitrogen oxides and ammonia. This reaction is conducted in such a manner as to prevent the by-produced ammonium nitrate from depositing on the catalyst. There is also disclosed a specific apparatus for practicing the method.
摘要:
A catalyst having high activity at a low temperature is obtained by heating rhodochrosite in air at a temperature of 300.degree.-500.degree. C. A catalyst having still higher activity at a low temperature is obtained by mixing rhodochrosite with a specific amount of a specific metal compound and heating the resultant mixture in air at a temperature of 300.degree.-500.degree. C.
摘要:
There is disclosed a method for removing nitrogen oxides from a nitrogen oxide-containing gas by contacting the gas with ammonia excited by ultraviolet irradiation in the presence of a catalyst to react the nitrogen oxides with the ammonia. According to the method, the reaction of nitrogen oxides with ammonia proceeds more rapidly than in the case of prior art methods.
摘要:
From an exhaust gas containing nitrogen oxides, the nitrogen oxides can be advantageously removed by contacting the exhaust gas with ammonia in the presence of a substance derived from laterite.