The oligomerization of glycerol to di- and triglycerol is an attractive reaction because these products find many applications in
cosmetics, food industry and polymer industry. To control the oligomerization degree, it is necessary to develop a selective catalyst. In
this work, two cesium mesoporous silica (MCM-41 and SBA-15) are compared in the selective oligomerization of glycerol into di- and
triglycerol. The catalysts were prepared by incipient-wetness impregnation. The results showed that the stability and the activity of catalysts
depend on the support nature. The use of SBA-15 support instead of MCM-41 leads to a more stable catalyst without changing polyglycerols
selectivity. Different characterizations showed that it is due to the larger wall thickness of SBA-15. This study also showed
that the nature of catalyst could influence the diglycerol isomers distribution. In fact the glycerol activation inside or outside the pores can
strongly modify the selectivity to linear or branched diglycerol isomers.
Keywords: Glycerol, Oligomerisation, SBA-15, MCM-41, Cesium.
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