Study on Optimization of Glycerol Oligomerization in Presence of γ-Alumina Supported Ca/Ce Mixed Oxides

  • 林 承巖

Student thesis: Doctoral Thesis

Abstract

In this work the solventless oligomerization of glycerol was studied and carried out in presence of calcium–cerium oxides supported on γ-alumina as catalyst The catalysts were successfully prepared by the incipient wetness impregnation method using Ce(NO3)3 and Ca(NO3)2 precursor solutions as well as γ-alumina as the support followed by calcination at 650℃ for 6 hours Various instruments including BET TGA XRD SEM and ICP-OES analyses were employed for characterization of these catalysts Typically the etherification reactions of glycerol as both reactant and solvent were carried out from 220℃ to 260℃ in nitrogen atmosphere Furthermore the design-of-experiment (DOE) principle mainly response surface methodology (RSM) mainly coupled with central composite design (CCD) was attempted to optimize this catalytic etherification process of glycerol The combined yield of diglycerol and triglycerol in linear forms was adopted as the response factor Under the optimal reaction conditions near 80% glycerol could be converted to polyglycerol after 8h using Ca-Ce/γ-alumina catalysts prepared from mixed solutions of Ca+2/Ce+3 in which the molar ratio of Ca/Ce is 3/1 with a loading as 2 wt% based on the initial mass of glycerol A selectivity of 89% for di-glycerol and tri-glycerol in linear form could be achieved accordingly
Date of Award2020
Original languageEnglish
SupervisorBing-Hung Chen (Supervisor)

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