Heterogeneous soft acid catalysis of the sucrose hydrolysis |
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Authors: | Dorina Chambre Maria-Raluca Szabo C Popescu Cornelia Idi?oiu |
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Institution: | (1) Chemical and Technological Research Center, Faculty of Food Engineering, Tourism and Environmental Protection, ’Aurel Vlaicu’ University of Arad, E. Drăgoi Str. 2, 310330 Arad, Romania;(2) Deutsches Wollforschunginstitut (DWI) an der RWTH Aachen, Aachen, Germany |
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Abstract: | Using a micro-calorimetrical DSC we have compared the acid-catalyzed inversion of sucrose in homogeneous and heterogeneous
systems. Acetic acid was chosen as catalyst for homogeneous system, and several carboxylic cationites were used as heterogeneous
catalysts. The kinetic apparent parameters (A, E, k
ap) for all the systems were calculated from DSC data with Friedmann’s method and catalytic constant, k323cat, was further inferred. We found that the specific catalyst efficiency, q
cat, in heterogeneous system is over 5000 times higher than in case of homogeneous ones. The activity of heterogeneous carboxylic
systems is still about 30 times larger than those of a strong mineral acid in homogeneous catalysis.
The results indicate the high efficiency of heterogeneous systems for soft acid catalysis of the sucrose hydrolysis. |
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Keywords: | carboxylic cationite catalysis homogeneous/heterogeneous catalysis sucrose acid hydrolysis |
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