Authors: Cauê A C Silva Flávia C A Figueiredo Raphael Rodrigues Mirela I Sairre Maraisa Gonçalves Ines Matos Isabel M Fonseca Dalmo Mandelli Wagner A Carvalho
Publish Date: 2016/02/27
Volume: 18, Issue: 5, Pages: 1551-1563
Abstract
Oxidized and sulfonatedactivated carbons AC were tested in the catalytic conversion of glycerol by acetalization reactions The solids were treated with concentrated nitric acid and/or fuming sulfuric acid AC ACN ACS and ACNS The presence of sulfur and an increase in the acidity of the solids demonstrate the suitability of the oxidation as well as the sulfonation process especially in the sample treated with concentrated nitric acid and fuming sulfuric acid ACNS The best catalyst for the reaction of glycerol acetalization with phenylacetaldehyde was ACNS with a phenylacetaldehyde conversion of 95 after 90 min at 383 K and selectivity of 88 and 12 respectively to dioxolane and dioxane These products can be used as hyacinth fragrance flavoring compounds Furthermore a contribution of homogeneous catalysis in these systems was not identified Thus we identified a possibility of glycerol conversion a biodiesel byproduct into valueadded products by suitable catalysts produced from activated carbons
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