Search for dissertations about: "lean NOx reduction"

Showing result 1 - 5 of 40 swedish dissertations containing the words lean NOx reduction.

  1. 1. NOx reduction with dimethyl ether in lean exhaust

    Author : Sara U Erkfeldt; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NOx storage; Dimethyl ether; ether; hydrocarbon-SCR; lean NOx reduction; alcohol; Cu-ZSM-5; lean NOx trap; alkane; alternative fuel;

    Abstract : There is a growing concern worldwide about the increase in anthropogenic greenhouse gas emissions, particularly carbon dioxide (CO2) from the combustion of fossil fuels. Vehicles with internal combustion engines contribute significantly to these emissions, which has led to an increased demand for engines running on alternative (non-fossil) fuels. READ MORE

  2. 2. Experimental studies of NOx storage catalysts -Preparation, characterisation, NOx regeneration and sulfur deactivation

    Author : Hussam Abdulhamid; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; sulfur poisoning; CO; DRIFT; precious metal; SO2; NOx storage; H2; NOx reduction; reducing agents; C3H6; H2O; C3H8; lean-burn;

    Abstract : .... READ MORE

  3. 3. Lean NOx reduction by alternative fuels - with focus on catalysts for dimethyl ether

    Author : Sara U Erkfeldt; [2011]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; biofuel; In2O3; lean NOx reduction; alumina; Cu-ZSM-5; Ga2O3; DME; hydrocarbon-SCR; alternative fuel; NOx storage; B2O3; Ag Al2O3;

    Abstract : There is an increased demand for diesel engines running on non-fossil fuels such as dimethyl ether (DME), biodiesel and synthetic diesel. DME is a promising alternative fuel with potential for high energy efficiency and low CO2 emissions. However, during all high temperature combustion NOx is formed, which may require exhaust aftertreatment. READ MORE

  4. 4. Lean NOx reduction with methanol over supported silver catalysts

    Author : Marika Männikkö; [2015]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lean NOx reduction; SCR; silver species; silver alumina; methanol; hydrogen; silver ZSM-5;

    Abstract : The oxygen rich and relatively cold exhaust gases from fuel-efficient combustion engines bring challenges for the reductive aftertreatment of NOx. In this context selective catalytic reduction over silver/alumina has shown positive results, especially with oxygenated reducing agents. READ MORE

  5. 5. Studies on Lean NOx Reduction with Ammonia. Catalysts and Sensors

    Author : Mikaela Wallin; [2005]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; catalysis; Pt SiO2; NOx reduction; gas sensor; DFT; SCR; H-ZSM-5; in situ FTIR; LCAO; DRIFT; high throughput screening; transient ammonia supply; ammonia; microemulsion; perovskite;

    Abstract : Selective catalytic reduction of NOx with ammonia, NH3-SCR, is a promising technique to reduce NOx under lean conditions, e.g. in diesel engine exhausts. The main objective of this thesis was to gain further understanding of key parameters affecting the performance of catalysts and sensors for NH3-SCR. READ MORE