Methods of removing NO/sub chi/ and SO/sub chi/ emissions from combustion systems using nitrogenous compounds

This patent describes a process for selectively reducing nitrogen oxides in combustion effluent streams. It comprises the steps of: introducing a reducing agent into a gaseous decomposition zone. The reducing agent having at least one functional group selected from the group comprising -NH and -CN, wherein the decomposition zone is substantially oxygen deficient and is maintained at a temperature in the range of from approximately 300{sup 0}F. to approximately 2400{sup 0}F.; introducing the resulting mixture from the decomposition zone to a reaction zone containing combustion effluents, the reaction zone having an excess of oxygen; and allowing the mixture from the decomposition zone sufficient residence time within the reaction zone to allow the reduction of the NO/sub chi/ within the combustion effluents.