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

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics (en)
skos:prefLabel	Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics Working-state Morphologies of Ion Exchange Catalysts and Their Influence on Reaction Kinetics (en)
skos:notation	RIV/67985858:_____/10:00353076!RIV11-AV0-67985858
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(AV0Z40720504)
http://linked.open...iv/cisloPeriodika	1-2
http://linked.open...vai/riv/dodaniDat	2011
http://linked.open...aciTvurceVysledku	Jeřábek, Karel Hanková, Libuše Holub, Ladislav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav chemických procesů AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	298913
http://linked.open...ai/riv/idVysledku	RIV/67985858:_____/10:00353076
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ion exchanger catalyst; morphology; esterification (en)
http://linked.open.../riv/klicoveSlovo	esterification morphology ion exchanger catalyst
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[A6CE02AE7CD9]
http://linked.open...i/riv/nazevZdroje	Journal of Molecular Catalysis A-Chemical
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...UplatneniVysledku	2010
http://linked.open...v/svazekPeriodika	333
http://linked.open...iv/tvurceVysledku	Jeřábek, Karel Hanková, Libuše Holub, Ladislav
http://linked.open...ain/vavai/riv/wos	000285772600014
http://linked.open...n/vavai/riv/zamer	Investigation of multiphase reacting systems for the design of processes important in synthesis and preparation of novel materials, in energy production and in environmental protection
issn	1381-1169
number of pages	15 (xsd:int)

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