METHODS AND CATALYSTS FOR GREEN BIODIESEL PRODUCTION FROM UNREFINED LOW GRADE FEEDSTOCK

摘要

This invention provides a catalyst comprising a new form of ZnFe2O4 spinel nanoparticles, and a method for preparing same. The catalyst is useful for catalyzing the esterification of fatty acids or transesterification of triglycerides, wherein the reaction rate and conversion can be enhanced by free fatty acids.

主权项

1. A method for preparing a ZnFe2O4 catalyst, comprising the steps of:
a. preparing a first solution by dissolving ethylenediaminetetraacetic acid (EDTA) in purified water, followed by adding a base until the pH is 3 to 10; b. preparing a second solution by dissolving a surfactant in purified water; c. adding the second solution dropwise to the first solution; d. preparing a third solution by dissolving a zinc salt and an iron (III) salt in purified water; e. adding the third solution dropwise into the solution resulting from step (c); f. drying the solution resulting from step (e) to form a dried mixed metal EDTA complex; g. calcining said dried mixed metal EDTA complex in air to obtain said ZnFe2O4 catalyst.