Abstract: The phenyl and chloropropyl silica derived from chlorosilane were applied to synthesize HSO3-functionalized silica by using H2SO4 or (NH4)2SO3 as sulfonation agents. The solid acid and their precursors were characterized by BET, IR, TOC (total organic carbon). The surface coverage density of phenyl-silica and chloropropy1-silica are 1.40mmol/g and　1.95mmol/g, while the acid exchange capacities are 0.32mmol/g and 0.26mmol/g, respectively. The specific surface area of phenyl-silica and chloropropy1-silica respectively decreased slightly from 521m2/g to 406m2/g and 432m2/g. The solid acids were used as catalysts in the synthesis of acetic acid butylester. The results indicate that the catalysts can be reused 5 times with a high conversion ratio.

Key words: synthesis of acetic acid butylester , sulfonation, solid acid, silica surface modification