Sökning: "SCR"

Visar resultat 1 - 5 av 96 avhandlingar innehållade ordet SCR.

  1. 1. Model Based Optimization of a Complete Diesel Engine/SCR System

    Författare :Claes Ericson; Förbränningsmotorer; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; MPC; model based optimization; real time models; model based control; SCR; optimization; EGR;

    Sammanfattning : Achieving upcoming emissions legislation (Euro VI) for heavy trucks is a serious challenge for the manufacturers. Apart from the increasingly strict limits on nitrogen oxides (NOx) and particulate emissions (PM), the limited amount of fossil fuels as well as alarming climate changes simultaneously drives the demand for low CO2 emissions. LÄS MER

  2. 2. Computational Fluid Dynamics and Experimental Studies of the Urea-SCR System

    Författare :Andreas Lundström; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; urea; SCR; decomposition; CYA; HNCO; NH3; CFD; thermolysis;

    Sammanfattning : Volatile emissions produced by the burning of fossil fuels may be converted on a catalyst to less harmful products. During lean combustion an excess of oxygen in the exhaust gases together with a catalyst effectively oxidizes carbon monoxide and hydrocarbons into carbon dioxide and water. LÄS MER

  3. 3. The effect of framework structure on N2O formation over Cu-based zeolites during NH3-SCR reactions

    Författare :Ghodsieh Isapour Toutizad; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; Catalysis; Infrared spectroscopy; SCR; MFI; Nitrous Oxide; CHA; Ammonium nitrate; BEA; Zeolites;

    Sammanfattning : Anthropogenic nitrous oxide (N2O), which is generally formed as a byproduct of industrial chemical processes and fossil fuel combustion, has attracted significant attention in recent years due to its destructive role in global warming and ozone layer depletion. Among different developed technologies applied for lean NOx reduction, the selective catalytic reduction (SCR) of NOx with ammonia (as a reducing agent) is presently the most used method. LÄS MER

  4. 4. Vehicle emissions abatement: NO oxidation and ammonia SCR

    Författare :Xavier Auvray; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; SpaciMS; NO oxidation; Cu-Beta zeolite; sulfur dioxide; Platinum; ammonia SCR; aging;

    Sammanfattning : The design and the development of catalytic systems for reducing vehicle emissions is a complex task due to the variety of components in a wide range of gas flow and temperature. A complete system is, therefore, composed of a series of catalysts or catalytic systems, each of which is dealing with a particular aspect of the abatement process. LÄS MER

  5. 5. Synthesis and functionalization of zeolites for NH3-SCR applications

    Författare :Alexander Shishkin; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; NH3-SCR; NOx reduction; Environmental catalysis; hydrothermal synthesis.; exhaust aftertreatment; zeolite functionalization;

    Sammanfattning : In the strive towards decreasing carbon dioxide emissions from the growing transport sector, the interest for more fuel-efficient combustion engines operating under lean (oxygen excess) conditions has increased. The combustion products, however, formed in such engines contribute considerably to air pollution. LÄS MER