Search for dissertations about: "Deactivation"

Showing result 1 - 5 of 152 swedish dissertations containing the word Deactivation.

  1. 1. Structural deactivation of supported metal catalysts

    Author : Bertil Stenbom; Chalmers University of Technology; []
    Keywords : CO-TPD; alumina; ceria; catalyst; TEM; rhodium; sintering; noble metal; platinum; deactivation;

    Abstract : .... READ MORE

  2. 2. Selective Catalytic Reduction of NOx: Deactivation and Regeneration Studies and Kinetic Modelling of Deactivation

    Author : Raziyeh Khodayari; Institutionen för kemiteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical technology and engineering; modelling; sulphation; regeneration; deactivation; bio fuel; WO3; V2O5; TiO2; catalyst; NOx; SCR; Kemiteknik och kemisk teknologi; Chemistry; Kemi;

    Abstract : Selective catalytic reduction of NOx (SCR) has been recognised as an effective post-combustion method for reducing nitrogen oxides from stationary sources. The cost of replacing the catalyst is a major part of the maintenance of the SCR system, hence it is desirable to advance methods to prolong the catalyst life. READ MORE

  3. 3. Hydrodeoxygenation (HDO) catalysts Characterization, reaction and deactivation studies

    Author : Houman Ojagh; Chalmers University of Technology; []
    Keywords : NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; Poisoning; Carbon deposition; Ring opening; Hydrodeoxygenation HDO ; Deactivation; Hydroconversion; Brønsted acid sites; Renewable diesel; Sulfided phase;

    Abstract : Production of biomass derived fuels such as renewable diesel, are primarily intended to reduce the reliance of the conventional engines on petroleum fuels as well as the emission of CO2 from fossil hydrocarbons. Hydrodeoxygenation (HDO) is a powerful technique that has been regularly used in the fuel upgrading processes. READ MORE

  4. 4. Study of Catalyst Deactivation in Three Different Industrial Processes

    Author : Ann-Charlotte Larsson; Mehri Sanati; Ferruccio Trifiro; Växjö universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; deactivation; catalyst; SCR; VOC; steam reforming; aerosol particle; potassium; zinc; ash salts; biomass; organosilicon; Chemical engineering; Kemiteknik; Kemi; Chemistry;

    Abstract : Deactivation of catalysts were investigated focusing on three industrial processes: 1) Selective Catalytic Reduction (SCR) for abatement of NOx from biomass combustion using V2O5-WO3 /TiO2 catalysts; 2) Catalytic oxidation of volatile organic compounds (VOC) from printing industries using a Pt/γ-Al2O3 catalyst; and 3) Ni and Pt/Rh catalysts used in steam reforming reaction of bio-syngas obtained from biomass gasification.The aim has been to simulate industrial conditions in laboratory experiments in order to comprehend influence of compounds affecting catalysts performance. READ MORE

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

    Author : Anna Fathali; Chalmers University of Technology; []
    Keywords : ; car exhaust; three-way catalyst TWC ; alumina; fuel-cut; palladium; hydrocarbon cracking; ceria; deactivation; oxygen storage capacity OSC ; rhodium; zirconia; sintering; monolith catalyst; catalysis;

    Abstract : 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. READ MORE