Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases

Clay, David T; Lynn, Scott

Title: Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases

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Abstract

A process for the simultaneous removal of sulfur oxides and nitrogen oxides from power plant stack gases comprising contacting the stack gases with a supported iron oxide catalyst/absorbent in the presence of sufficient reducing agent selected from the group consisting of carbon monoxide, hydrogen, and mixtures thereof, to provide a net reducing atmosphere in the SO.sub.x /NO.sub.x removal zone. The sulfur oxides are removed by absorption substantially as iron sulfide, and nitrogen oxides are removed by catalytic reduction to nitrogen and ammonia. The spent iron oxide catalyst/absorbent is regenerated by oxidation and is recycled to the contacting zone. Sulfur dioxide is also produced during regeneration and can be utilized in the production of sulfuric acid and/or sulfur.

Inventors:

Clay, David T ^[1]; Lynn, Scott ^[2]

Longview, WA
Walnut Creek, CA

Issue Date:: 1976-10-19

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

OSTI Identifier:: 862673

Patent Number(s):: 3987146

Assignee:: United States of America as represented by United States Energy (Washington, DC)

Patent Classifications (CPCs):: Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02A - TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION

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Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02A - TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
Y02A50/20 - Air quality improvement or preservation

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
B01D53/60 - Simultaneously removing sulfur oxides and nitrogen oxides

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DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: simultaneous; removal; nitrogen; oxides; sulfur; combustion; gases; process; power; plant; stack; comprising; contacting; supported; iron; oxide; catalyst; absorbent; presence; sufficient; reducing; agent; selected; consisting; carbon; monoxide; hydrogen; mixtures; provide; net; atmosphere; zone; removed; absorption; substantially; sulfide; catalytic; reduction; ammonia; spent; regenerated; oxidation; recycled; dioxide; produced; regeneration; utilized; production; sulfuric; acid; gases comprising; oxide catalyst; nitrogen oxide; simultaneous removal; iron sulfide; sulfur oxide; sulfur oxides; reducing atmosphere; nitrogen oxides; carbon monoxide; sulfuric acid; sulfur dioxide; combustion gases; iron oxide; power plant; reducing agent; combustion gas; stack gases; catalytic reduction; agent selected; comprising contacting; stack gas; plant stack; contacting zone; supported iron; /423/

Citation Formats


                    Clay, David T, and Lynn, Scott. Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases.  United States: N. p., 1976. 
        Web.

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                    Clay, David T, & Lynn, Scott. Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases.  United States.

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                    Clay, David T, and Lynn, Scott. Tue .  
        "Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases".  United States.  https://www.osti.gov/servlets/purl/862673.

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@article{osti_862673,

  title        = {Simultaneous removal of nitrogen oxides and sulfur oxides from combustion gases},

  author       = {Clay, David T and Lynn, Scott},

  abstractNote = {A process for the simultaneous removal of sulfur oxides and nitrogen oxides from power plant stack gases comprising contacting the stack gases with a supported iron oxide catalyst/absorbent in the presence of sufficient reducing agent selected from the group consisting of carbon monoxide, hydrogen, and mixtures thereof, to provide a net reducing atmosphere in the SO.sub.x /NO.sub.x removal zone. The sulfur oxides are removed by absorption substantially as iron sulfide, and nitrogen oxides are removed by catalytic reduction to nitrogen and ammonia. The spent iron oxide catalyst/absorbent is regenerated by oxidation and is recycled to the contacting zone. Sulfur dioxide is also produced during regeneration and can be utilized in the production of sulfuric acid and/or sulfur.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1976},

  month        = {10}

}

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