Sökning: "exhaust gas catalysis"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden exhaust gas catalysis.

  1. 1. Catalytic Reduction of NOx on Heavy-Duty Trucks

    Författare :Christian Künkel; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kemiteknik och kemisk teknologi; Chemical technology and engineering; real time; strategy; model; catalysis; exhaust gas; diesel; automotive; deNOx; NOx reduction; NOx storage; HC-SCR; Carbochemistry; petrochemistry; fuels and explosives technology; Petrokemi; bränslen; sprängämnen;

    Sammanfattning : The objective of the work described in this thesis is to identify the principles and parts of an aftertreatment system for the catalytic NOx reduction for heavy-duty diesel vehicles, and to demonstrate such a system in full-scale. The reducing agent is diesel fuel. LÄS MER

  3. 2. New Materials in Environmental Catalysis

    Författare :Magnus Skoglundh; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cobalt; Copper; Xylene oxidation; Platinum; Carbon monoxide oxidation; exhaust gas catalysis; Rhodium; Palladium; Nitric oxide reduction; perovskites;

    Sammanfattning : This thesis presents new approaches to the control of emissions within the field of environmental catalysis. Three catalytic systems; bimetallic catalysts, perovskites and promoted catalysts have been prepared and evaluated for complete oxidation of volatile organic compounds and for simultaneous conversion of CO, hydrocarbons and nitrogen oxides. LÄS MER

  4. 3. Catalysts for Car Exhaust: Oxygen Storage in Platinum/Ceria and Mass Transfer in Monoliths

    Författare :Anna Holmgren; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; car exhaust; catalysis; flow distribution; mass transfer; oxygen storage capacity OSC ; ceria; computational fluid-dynamics simulations; monolith catalyst; platinum; oxygen transport;

    Sammanfattning : In this work, the oxygen storage/release in Pt/ceria catalysts has been investigated both experimentally and theoretically. Moreover, the flow distribution and mass transfer in monolith catalysts for car-exhaust purification have been studied. LÄS MER

  5. 4. Deactivation of commercial three-way catalysts: Experimental and theoretical studies

    Författare :Anna Fathali; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; car exhaust; three-way catalyst TWC ; alumina; fuel-cut; palladium; ; hydrocarbon cracking; ceria; deactivation; oxygen storage capacity OSC ; rhodium; zirconia; sintering; monolith catalyst; catalysis;

    Sammanfattning : This PhD thesis is a summary of my work with thermal deactivated commercial three way catalysts (TWCs). An examination of catalytic properties, before and after accelerated aging was performed, such as light-off temperature, specific surface area (BET), noble metal dispersion and oxygen storage capacity was performed. LÄS MER

  7. 5. FTIR Studies and Kinetic Modelling of NOX Reduction and NOX Storage

    Författare :Björn Westerberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NOX storage; kinetic modelling; diesel exhaust; alumina; NOX reduction; FTIR spectroscopy; catalysis;

    Sammanfattning : FTIR spectroscopy and kinetic modelling have been used to study catalysts for NOX reduction and NOX storage. For Pt/Al2O3 exposed to NO, oxygen and propene IR-bands associated with nitrates, acetate, formate, carbonates and isocyanate were observed. Experiments with NO, oxygen and HNCO showed that isocyanate is an intermediate for reduction of NOX. LÄS MER