# US 7,608,226 B2 · Exhaust stream treatment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,226 B2 - Document ID: US7608226B2 - Status: Granted - Kind: B2 - Application number: 12/053,876 - Filed: 2008-03-24 - Published: 2008-07-24 - Granted: 2009-10-27 - Earliest claimed: 2005-07-11 - Assignees: General Electric Company - Inventors: Teresa Grocela Rocha; Alison Liana Palmatier; Jonathan Lloyd Male; John Dewey Blouch; Benjamin Rue Wood; Frederic Vitse - Web page: https://patentgrep.com/patent/US7608226B2 ## CPC - B01D 53/9409: {Nitrogen oxides} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F02C 3/30: Adding water, steam or other fluids {for influencing combustion, e.g. to obtain cleaner exhaust gases (F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence)} - B01D 2251/208: Hydrocarbons - F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel - F01N 2610/10: the substance being heated, e.g. by heating tank or supply line of the added substance - F05D 2270/082: with as little NOx as possible - Y02T 10/12: Improving ICE efficiencies - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A method comprises injecting a reductant stream comprising a hydrocarbon reductant and water into an exhaust chamber comprising a nitrogen oxide-containing exhaust stream; contacting a composition comprising the reductant stream and exhaust stream with a catalyst; and decreasing a concentration of the nitrogen oxide in the composition comprising the reductant stream and exhaust stream. An exhaust stream treatment system, comprises an exhaust chamber comprising a catalyst; an exhaust stream comprising a nitrogen oxide; and a reductant stream comprising a hydrocarbon reductant and water. ## Claims ### Claim 1 An exhaust stream treatment system, comprising: an exhaust chamber comprising a catalyst; an exhaust stream comprising a nitrogen oxide; and a reductant stream comprising a hydrocarbon reductant and from about 0.01 to about 15 volume percent water, based upon the reductant stream. ### Claim 2 (depends on 1) The exhaust stream treatment system of claim 1, wherein the catalyst is a metal-oxide based catalyst, a zeolite-type catalyst, a precious-metal catalyst, or a combination comprising at least one of the foregoing catalysts. ### Claim 3 (depends on 1) The exhaust stream treatment system of claim 1, wherein the hydrocarbon is hexane, butane, propane, ethane, 2,2,4-trimethyl pentane, octane, propene, ethene, butene, methanol, ethyl alcohol, 1-butanol, 2-butanol, 1-propanol, isopropanol, dimethyl ether, dimethyl carbonate, acetaldehyde, acetone, isobutanol, or a combination comprising at least one of the foregoing hydrocarbons. ### Claim 4 (depends on 1) The exhaust stream treatment system of claim 1, wherein a ratio of the exhaust stream to the reductant stream is about 50 to about 10000. ### Claim 5 (depends on 1) The exhaust stream treatment system of claim 1, wherein the exhaust chamber is a portion of a turbine engine. ### Claim 6 (depends on 1) The exhaust stream treatment system of claim 1, further comprising an injection and control skid in fluid communication with the exhaust chamber. ### Claim 7 (depends on 6) The exhaust stream treatment system of claim 6, further comprising an injection grid in fluid communication with the injection and control skid. ### Claim 8 (depends on 7) The exhaust stream treatment system of claim 7, wherein the injection grid comprises a plurality of injection nozzles. ### Claim 9 (depends on 8) The exhaust stream treatment system of claim 8, wherein the hydrocarbon reductant and water are injected from the injection grid independently, but simultaneously. ### Claim 10 (depends on 8) The exhaust stream treatment system of claim 8, wherein the hydrocarbon reductant and water are injected from the injection grid independently and alternately. ### Claim 11 (depends on 8) The exhaust stream treatment system of claim 8, wherein the hydrocarbon reductant and water are mixed in the injection and control skid prior to being injected into the exhaust chamber. ### Claim 12 (depends on 7) The exhaust stream treatment system of claim 7, further comprising a source of heat operatively disposed relative to the injection and control skid. ### Claim 13 (depends on 7) The exhaust stream treatment system of claim 7, further comprising a means for pressurizing the hydrocarbon reductant and/or water operatively disposed relative to the injection and control skid.