Sulfonic acid bearing mesoporous materials as catalysts in furan and polyol derivatization**This work was supported in a IUAP-PAI program of the Belgian Federal Government. W.V.R. acknowledges IWT and D.D.V. FWO for fellowships.

Dual-functionalized large pore mesoporous silica as an efficient catalyst for bisphenol-A synthesis

“…On the other hand, a broad absorbance around 2850-3000 cm À1 and a weak peak around 1450-1470 cm À1 are attributed to the stretching and bending vibration of methylene groups, further confirming the incorporation of organic groups. No clear information about the presence of thiol S-H species was obtained from IR studies, since the S-H stretching vibration at about 2575 cm À1 was usually very weak and difficult to detect [33].…”

Combined Alkyl and Sulfonic Acid Functionalization of MCM-41-Type Silica

“…It has been reported that the activity of USY catalysts in the esterification of benzoic and phenylacetic acids with short chain alcohols increases with the hydrophobicity of the catalyst (6). Also, the higher activity and selectivity of [SO 3 H]-MCM materials in the reaction of sorbitol with lauric acid in comparison with zeolites has been attributed to the higher hydrophobicity of the former (14,16).…”

“…Several oxidation procedures have been described in the literature. Lim et al(15) reported the use of nitric acid, whereas Van Rhijn et al(16) preferred hydrogen peroxide for this purpose. We have found before that the oxidation with nitric acid of SH-MCM-41…”

Combined Alkyl and Sulfonic Acid Functionalization of MCM-41-Type Silica

“…Recently, the synthesis of mesoporous materials containing immobilized sulfonic acid groups which behave as active and selective catalysts of the esterification reaction of polyols with fatty acids has been reported (1)(2)(3). The improved catalytic performance of these materials as compared with zeolites has been attributed to their larger pore size and increased hydrophobicity (3), inherent to the presence of the alkyl chain belonging to the propylsulfonic group anchored on the surface.…”