Počet záznamů: 1

Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics

  1. 1.
    0353076 - UCHP-M 2011 RIV NL eng J - Článek v odborném periodiku
    Jeřábek, Karel - Hanková, Libuše - Holub, Ladislav
    Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics.
    Journal of Molecular Catalysis A-Chemical. Roč. 333, 1-2 (2010), s. 109-113 ISSN 1381-1169
    Grant ostatní: DCH(US) BD20
    Výzkumný záměr: CEZ:AV0Z40720504
    Klíčová slova: ion exchanger catalyst * morphology * esterification
    Kód oboru RIV: CC - Organická chemie
    Impakt faktor: 2.872, rok: 2010

    The esterification of fatty acids is an important pretreatment step in the production of biodiesel from low-cost raw materials. It was thus used as a model reaction in a study of the influence of concentration variations of the polar component (methanol) in a reaction mixture on the morphology and functioning of ion exchange catalysts. For a gel-type ion exchange catalyst, a decrease in the methanol concentration proved to have unambiguously negative effects, as it induced de-swelling of the polymer matrix and diminished the accessibility of the active centers. For macroreticular ion exchange catalysts, on the other hand, the drop in methanol concentration had a positive influence on the efficiency of the catalytic action mechanism of the acidic centers. This was due to the existence of some swelling-independent porosity, causing a shift from a general to a specific catalysis-like mechanism.
    Trvalý link: http://hdl.handle.net/11104/0192420