In terms of catalyst, J. - M. clacens et al. Of France studied a new type of mesoporous solid catalyst containing CS, which can reduce the branched chain and cyclic glycerin, and the formation of acrolein and other impurities during glycerol polymerization Ahmed et al. Used a variety of different zeolites as catalysts to study the solvent-free process of dimer and trimer glycerol, and characterized the performance of the catalyst by different characterization methods. It was found that the selectivity and activity of the catalyst were affected by the acidity of zeolite, and the method of adding metal elements was used to increase the catalytic performance of the catalyst. The results showed that under the specific combination conditions, the catalyst showed high catalytic performance, and the content of diglycerol was also high. Compared with the traditional catalyst, the catalyst can be recycled and reused.<br>
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