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Thetford-Mines, Canada

Jean D.,Laval University | Nohair B.,Laval University | Bergeron J.-Y.,Oleotek | Kaliaguine S.,Laval University
Industrial and Engineering Chemistry Research | Year: 2014

Batch hydrogenolysis of concentrated glycerol has been conducted over different Cu/ZnO-based catalysts prepared by the coprecipitation method. The catalysts were characterized by X-ray diffraction, H2 temperature-programmed reduction, and the N2O titration technique of measurement of the metallic Cu surface area. Results show that the reaction system is affected by hydrogen pressure, temperature, glycerol concentration, and the surface area of metallic copper. Our results tend to show that the reaction scheme is more complicated than the commonly accepted dehydration-hydrogenation mechanism. Tests conducted with varying hydrogen pressure indicate that the mechanism may begin with the dehydrogenation of glycerol to glyceraldehyde. Tests conducted with varying water content tend to show that high water content favors ethylene glycol (EG) formation. The selectivity to 1,2-propanediol (12PG) versus ethylene glycol is a function of the relative reaction rates where the glyceraldehyde can react to either yield 12PG or go through a retro-Claisen route to yield EG. Finally, multiple catalytic tests conducted with a constant amount of copper surface area show that, according to the Madon-Boudart criterion, the catalytic system is heavily hampered by transport phenomena limitations. © 2014 American Chemical Society. Source


Grant
Agency: GTR | Branch: Innovate UK | Program: | Phase: Innovation Voucher | Award Amount: 5.00K | Year: 2015

This is food product concept that aims at reducing the saturated fat content in a bakery margarine by as much as 50% using a novel structuring approach. Formulation is achieved by combining a liquid vegetable oil with a surface -active food grade emulsifier and the product is intended for use in the manufacture of cakes and biscuits. This product provides the same quality performance as a standard bakery margarine used in the industrial production of cakes and biscuits and in addition is a healthier option. It is expected that this product will assist industrial cake and biscuit manufacturers to improve the health status of their products and achieve guidelines stipulated by the Food Standards Agency.


Azzouz A.,University of Quebec at Montreal | Nousir S.,University of Quebec at Montreal | Platon N.,University of Quebec at Montreal | Platon N.,University of Bacau | And 7 more authors.
Materials Research Bulletin | Year: 2013

Na-montmorillonite modification by the incorporation of hyperbranched polyglycerol dendrimers with average molecular weight 500, 1100 and 1700 g/mol and derived from soybean oil resulted in hybrid matrices with improved hydrophilic character and affinity toward carbon dioxide. Thermal analyses and thermal programmed desorption revealed that the dendrimer incorporation improved the amount of adsorbed water. The hydration grade was found to be proportional to the number of OH groups incorporated, and can double with the insertion of polyglycerol 500, 100 and 1700 at low dendrimer loadings. Inversely, higher dendrimer contents appeared to affect the hydrophilic character, favoring dendrimer aggregation into dense clusters, which reduces the number of OH groups accessible. This phenomenon was more accentuated with larger dendrimers. FTIR investigations also demonstrated that polyglycerol-based organoclays display improved interactions with water and/or carbon dioxide as compared to the starting material. The amount of adsorbed water was found to correlate with that of carbon dioxide, suggesting a certain contribution in CO2 retention. Crown Copyright © 2013 Published by Elsevier Ltd. All rights reserved. Source

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