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

0353076 - ÚCHP 2011 RIV NL eng J - Journal Article
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 - others:DCH(US) BD20
Institutional research plan: CEZ:AV0Z40720504
Keywords : ion exchanger catalyst * morphology * esterification
Subject RIV: CC - Organic Chemistry
Impact factor: 2.872, year: 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.
Permanent Link: http://hdl.handle.net/11104/0192420