Composite of kaolin and ionic liquid containing acidic polymer: A highly selectivecatalyst for glycerol acetalization to solketal

A highly selective catalyst is designed that can selectively acetalize glycerol to solketal. kaolin claywas first decorated with an acidic polymer. The carboxylic acid groups of the polymer were changed to ionicliquids. Finally, phosphotungstic acid was immobilized on the composite and the resultant catalyst wascharacterized. It was found that ۱۰ wt.% catalyst with ۲۰ wt.% phosphotungstic acid loading led to ۱۰۰%conversion and ۹۹% yield to solketal under solvent-free condition.

Keywords:

Heteropolyacid , Kaolin , Catalyst , Glycerol acetalization , Solketal