Search for dissertations about: "zeolite acidity"

Found 5 swedish dissertations containing the words zeolite acidity.

  1. 1. Partial Oxidation of Methane over Functionalised Zeolites and Zeotypes

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Xueting Wang; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; FTIR; Heterogeneous catalysis; Copper boron silicate; Zeolite; Natural gas; Biogas; Green methanol; zeotype; Temperature-programmed desorption; Cu-SSZ-13; Cu-ZSM-5; In situ infrared spectroscopy;

    Abstract : Partial oxidation of methane to methanol is an industrially important process that allows natural gas and biogas to be utilised for methanol-based production of chemicals or converted to liquid methanol fuel, which make transportation more facile. In this thesis, the activity for partial oxidation of methane to methanol over copper functionalised zeolites and silica supported copper is investigated using a three-step quasi-catalytic approach including catalyst activation, methane reaction and methanol extraction by water. READ MORE

  2. 2. Partial methane oxidation: insights from first principles and micro-kinetics calculations

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Adam Arvidsson; [2019]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; zeolite acidity; zeolites; density functional theory; microkinetic modelling; molybdenum sulfide cluster; partial methane oxidation;

    Abstract : Partial methane oxidation is a much-desired reaction with some intriguing challenges. Not only is there a need to activate methane and oxygen, but there is also a need to control the selectivity and prevent over-oxidation to thermodynamically more stable products, like carbon dioxide and water. READ MORE

  3. 3. Fundamental studies of catalytic systems for diesel emission control

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Xavier Auvray; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NH3 SCR; NO oxidation; sulfur; hysteresis; kinetic modeling; SpaciMS; catalyst acidity; DOC; aging; Pt Al2O3;

    Abstract : Due to global lean exhaust gas and new emission regulations, exhaust aftertreatment systems of diesel engines are more and more sophisticated and composed of a series of catalytic units. In the present work, two of these catalytic systems were studied with different approach. READ MORE

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

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Houman Ojagh; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Renewable diesel; Sulfided phase; Carbon deposition; Poisoning; Hydroconversion; Deactivation; Brønsted acid sites; Ring opening; Hydrodeoxygenation HDO ;

    Abstract : Hydrodeoxygenation (HDO) catalysts Characterization, reaction and deactivation studies Houman Ojagh Department of Chemistry and Chemical Engineering Chalmers University of Technology 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

  5. 5. Study of H2/CO/CO2 adsorption on MFI zeolites for CO2 selective WGS membrane reactor concept

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Sang Wirawan; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; FTIR spectra; CO2 selective; adsorption; MFI zeolites; Langmuir model; WGS membrane reactor; TPD;

    Abstract : The single-component adsorption behavior of CO, CO2 and multi-component adsorption of H2/CO2, CO/CO2, and H2/CO/CO2 on silicalite-1 and cation exchanged MZSM-5 zeolites (M = H, Na, and Ba) were investigated by a step change response method. Temperature programmed desorption (TPD) and in-situ fourier transform infrared (FTIR) spectroscopy were also performed to study the type of adsorbed species and their thermal stabilities. READ MORE