Noble metal supported catalysts for lactose transformations in liquid phase
(2014)
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- Abstract
- Carbohydrates are an important source of renewable materials which can be converted into high added-value products. Sugar transformations should ideally be carried out with recyclable catalysts, in water, with the highest possible selectivity in the desired product. The aim of the present work was to explore the microstructural properties of the heterogeneous catalysts needed to carry out selectively lactose oxidation into lactobionic acid and lactose hydrogenation into lactitol. The first part consisted in the investigation of the influence of two functionalized supports (γ-Al2O3 and Cxerogel) modified by metallic precursor grafting and activation on the catalytic performances in lactose oxidation. The oxygenated functions were shown to be detrimental. This was confirmed by the results obtained with an inert support, boron nitride, which can be a promising alternative support, ensuring high selectivity. Subsequently, the optimal range of particle size within Pd/h-BN catalysts for high activity and selectivity was investigated and the optimal size was determined between 3 and 15 nm with no particles inferior to 3 nm. The effectiveness of Au/h-BN was also evaluated and it exhibited spectacular performances. Au/h-BN was shown to be a good candidate for thermal regeneration for recycling. Lactose hydrogenation was finally investigated with Pd/h-BN and particles inferior to 3 nm were also undesired. The selectivity obtained in lactose hydrogenation seems to be greatly dependent on the mechanism of each possible side reaction.
- Affiliations
UCLouvain SST/IMCN/MOST - Molecules, Solids and Reactivity
Citations
Meyer, N. (2014). Noble metal supported catalysts for lactose transformations in liquid phase. https://hdl.handle.net/2078.5/49786