Immobilization of Sulfonic Acids via Grafting and Coating

By analogy with the amorphous supports, preformed MCM-41 can be functionalized by reaction of surface silanols or siloxanes with silylating agents such as 

3-mercaptopropyltrimethoxysilane. After oxidation of the thiols with H2O2, a solid sulfonic acid is obtained [30,32], Because of the high surface area (up to 1000 m g ) and the ordered pore structure, organosiloxane loadings tend to be significantly higher for MCM-41 materials than for amorphous silicas [12], 

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