Method for reducing NOx from exhaust gases produced by industrial processes

A method for reducing NOx in an exhaust gas in an industrial process, comprising contacting the exhaust gas with a reductant effective for NOx reduction under autocatalytic conditions at a location in the exhaust gas flowpath where the exhaust gas is autothermally heated to achieve said autocatalytic conditions using one or more hydrocarbons, and wherein the reductant comprises urea,

• wherein the industrial process comprises a combustion process including the generation of steam, mechanical work, electricity or the processing of petrochemicals, and wherein the combustion process utilizes an internal combustion engine, a boiler, a furnace, a heater or an incinerator.

A method for reducing NOx in an exhaust gas in an industrial process, comprising contacting the exhaust gas with a reductant effective for NOx reduction under autocatalytic conditions at a location in the exhaust gas flowpath where the exhaust gas is autothermally heated to achieve said autocatalytic conditions using one or more hydrocarbons, wherein the reductant comprises HNCO,

• wherein the industrial process comprises a combustion process including the generation of steam, mechanical work, electricity or the processing of petrochemicals, and wherein the combustion process utilizes an internal combustion engine, a boiler, a furnace, a heater or an incinerator.

A method for determining a level of NOx depletion by an autocatalytic process in an exhaust gas stream in an industrial process, comprising:

• contacting the exhaust gas stream with one or more hydrocarbon(s) and one or more reductant(s) effective for reduction of NOx at a first location so that the exhaust gas is autothermally heated to autocatalytically deplete NOx in the gas stream;
• measuring the amount of NOx at a second location in the exhaust gas stream downstream from the first location,
• wherein the industrial process comprises a combustion process including the generation of steam, mechanical work, electricity or the processing of petrochemicals, and wherein the combustion process utilizes an internal combustion engine, a boiler, a furnace, a heater or an incinerator.