Preparation of Solid Organic Base Catalysts Using Different Supports and Their Applications in Transesterification
Date Issued
2015
Date
2015
Author(s)
Li, Cheng-Hsiu
Abstract
The Mg-Al layered double hydroxides (LDHs), silica gel and zirconium hydroxide grafted with aminopropyl-groups, 3-guanidinylpropyl-groups and 2-formylimidazolylpropyl-groups were prepared and used as the base catalysts for transesterification. LDHs intercalated with carbonate and DS (dodecyl sulfate) were prepared by co-precipitation method, and the effect of interlayer anions on the grafting of amino-groups was examined. The amine-grafted materials were characterized by X-ray diffraction (XRD), nitrogen sorption isotherms, Element Analysis (EA) and thermo-gravimetric analysis (TGA). The catalytic activities of amine-grafted materials were compared with the pristine materials in base-catalyzed transesterification. Transesterification was performed at reflux temperature, using a fixed methanol to triacetin mole ratio of 6:1 and catalyst of 3 wt% (based on the quantity of triacetin used). One-pot transformation of triacetin with methanol using guanidine-grafted Zirconium hydroxide gave a 58.2% FAME yield after 40 min, with 83.9% conversion for transesterification.
Subjects
heterogeneous catalysts
transesterification
solid organic base catalysts
Type
thesis
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