OR3-32 Conversion of Monosaccharides into 5-Hydroxymethylfurfural and Furfural Using Acidic Templated Mesoporous Carbons

Resumo

The platform molecules 5-hydroxymethylfurfural (HMF) and furfural can be obtained by the dehydration of fructose and xylose, respectively, in Brønsted acid catalysis. We prepared 10 Brønsted Templated Mesoporous Carbons (BTMC) for these reactions. The characterizations showed that they present 2 different groups of acid sites, as well the Amberlysts 45 and 15, being the stronger sites related to sulfonic or phenylsulfonic acid species. A volcano plot was found in the correlation of TON_Platform with their percentage of stronger sites, indicating that the highest TON_Platform happens in the range of 70-80 % of stronger acid sites, belonging to the catalysts CMK-3-PSA, CMK-5-PSA, CMK-8-PSA and S-CMK-8-PSA. In the second part of this work, Bifunctional Templated Mesoporous Carbons (BiTMC) were prepared by the partial ion exchange of the CMK-8-PSA and Amb-45 with Al(III), Sc(III), Fe(III), Cu(II), Sn(IV) and Yb(III). They were used in the conversion of glucose into HMF, a more economically reaction that occurs by Lewis and Brønsted acid catalysis. The best results were obtained for the catalysts with Sn(IV), which had the best combination of Lewis and Brønsted acid sites to produce HMF.