NO reduction using sublimation of cyanuric acid

A method of reducing the NO content of a gas stream comprising contacting the gas stream with an amount of HNCO at a temperature effective for heat induced decomposition of HNCO, said amount and temperature being effective for resultant lowering of the NO content of the gas stream, and wherein said contacting is carried out in the presence of a surface which is effective as a catalyst for at least one of the reactions between heat induced decomposition products of HNCO and other components in said gas stream, which reactions lead to lowering of the NO content of the gas stream, or is effective as a catalyst for generating free radicals in the thermal decomposition of HNCO.

A method of reducing the NO content of a gas stream comprising contacting the gas stream with an amount of HNCO at a temperature effective for heat induced decomposition of HNCO, said amount and temperature being effective for resultant lowering of the NO content of the gas stream, and said HNCO being added to said gas stream as a solution of a sublimable solid in a solvent therefor, said sublimable solid producing HNCO upon sublimation.

A method of reducing the NO content of a gas stream comprising contacting the gas stream with an amount of HNCO at a temperature effective for heat induced decomposition of HNCO, said amount and temperature being effective for resultant lowering of the NO content of the gas stream, and wherein the HNCO is generated by sublimation of a solid other than cyanuric acid which produces HNCO upon sublimation.

A method of reducing the NO content of a gas stream comprising contacting the gas stream with an amount of HNCO at a temperature effective for heat induced decomposition of HNCO, said amount and temperature being effective for resultant lowering of the NO content of the gas stream, and wherein the temperature of the gas stream is less than about 800.degree. C.