Étude expérimentale et optimisation des conditions opératoires de l'oxydation catalytique du lactose en acide lactobionique

Authors: Bouasker, Hassen
Advisor: Belkacemi, KhaledHamoudi, Safia
Abstract: Lactose is among the most abundant carbohydrates present in milk. However, despite its many applications in dairy and pharmaceutical industries, it remains underutilized. Hence, it would be interesting to study its selective transformation through catalytic oxidation to obtain derivative products with added-value that can be used in food or pharmaceutical applications. This work aims to study the lactose conversion to lactobionic acid via catalytic oxidation in the presence of a bimetallic catalyst based on palladium and bismuth supported on mesostructured silica SBA-15 (1.02% Pd_0, 64% Bi/SBA-15). The optimization of reaction parameters such as temperature, pH, oxygen rate and the strategy to introduce oxygen was carried out to determine the best operating conditions maximizing the catalytic activity and selectivity of the reaction. The analysis of the reaction samples of lactose oxidation by high-performance liquid chromatography (HPLC) showed that lactobionic acid is the only product formed under the optimized conditions, namely: temperature = 65 ° C, pH = 9 and the oxygen flow rate = 40mL/min. The conversion rate of lactose is then close to 98% with selectivity of 100 % towards lactobionic acid. Furthermore, it was shown that the catalyst reactivated by reduction under a hydrogen stream, can be reused several times, while conserving its activity.
Document Type: Mémoire de maîtrise
Issue Date: 2010
Open Access Date: 16 April 2018
Permalink: http://hdl.handle.net/20.500.11794/21344
Grantor: Université Laval
Collection:Thèses et mémoires

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