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In this work, the phenylsulfonic acid functionalized SBA-15 silica was prepared by the reaction of mesoporous SBA-15 silica with phenyltrimethoxysilane, followed by the sulfonation with chlorosulfonic acid. The functionalized SBA-15 silica was then tested as a heterogeneous acid catalyst in the esterification of free fatty acid (FFA) present in vegetable oils with methanol. The textural feature and...
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