Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2015 m. Nr. 2 New methods of glyceric and lactic acid production by catalytic oxidation of glycerol. New method of synthesis of a catalyst with enhanced activity and selectivity
Rapeseed oil, which is the feedstock for biodiesel manufacturing, cannot be fully converted to biodiesel due to the forming of glycerol as the by-product. Glycerol liquid phase catalytic oxidation with molecular oxygen is one of the most promising methods for glycerol utilization. The new, extraction-pyrolytic, method for supported catalyst synthesis is worked out. It is demonstrated that the method can be used for the preparation of supported palladium and platinum catalysts for selective glycerol oxidation. It is possible to reach 72–78% yield by glyceric acid with full glycerol conversion by oxidizing glycerol in the presence of 1.25–2.5% Pd/Al2O3 catalyst. The yield of 54% by lactic acid with glycerol conversion ratio of 86% is reached in the presence of 1.25% Pt/Y2O3 catalyst.
Keywords: biodiesel, glycerol, oxygen, heterogeneous catalyst |
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