24 research outputs found
Esterification of dicarboxylic acids to diesters over Mn+-montmorillonite clay catalysts
Full text linkSurface Modifications in Talc in Order to Obtain Composite Materials Based on Polypropylene. A Comparative Study Between Elastic Moduli in Tensile Tests
No full textDetermination of Catalyst Surface Acidity in Liquids by a Pulse Liquid Chromatographic Technique
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Zur Frage der Unterscheidung zwischen H2O-Molekeln und OH-Gruppen in Gl�sern und Mineralen
No full textPOLYPROPYLENE/TALC COMPOSITES: INTERFACIAL MODIFICATIONS BY SURFACE TREATMENTS ON THE SOLID PARTICLES
No full textCatalytic hydrocondensation of carbon monoxide with olefins and their hydropolymerization under the action of carbon monoxide and hydrogen
No full textOPTIMIZATION OF THE OPERATION IN A REACTOR WITH CONTINUOUS CATALYST CIRCULATION IN THE GASEOUS BENZYL ALCOHOL POLYMERIZATION
No full textNarrow-range ethoxylation of fatty alcohols promoted by a zirconium alkoxide sulfate catalyst
No full textZirconium dodecanoxide sulfate is a very active catalyst in promoting fatty alcohol narrow-range ethoxylation. The catalytic activity is initially very high but rapidly decreases after the addition of one mole of ethylene oxide per mole of substrate. This peculiar behavior makes it possible to obtain narrow-range ethoxylated products containing not more than two or three ethylene oxide units. Because the catalyst shows a very feeble Brönsted acidity, it must be concluded that its activity originates from the Lewis acidity. This acidity is strongly enhanced from the introduction of the sulfate group in the catalyst molecule, because of the strong electron-withdrawing effect of this group. A kinetic model was developed for explaining experimental results
