title: Enhancement of biodiesel synthesis from soybean oil by potassium fluoride modification of a calcium magnesium oxides catalyst.
abstract: Transesterification of soybean oil with methanol was carried out in the presence of CaO-MgO and KF-modified CaO-MgO catalysts at atmospheric pressure. While the methyl ester yield for the CaO-MgO catalyst with a ratio of 8:2 (CaO:MgO) was 63.6%, it was 97.9% for the KF-modified catalyst at a 2% catalyst to the reactants (methanol/oil mixture) weight ratio, a temperature of 65 °C, a methanol-soybean oil ratio of 9:1 and a reaction time of 2.5 h. The KF/CaO-MgO catalyst still yielded 86.7% after four successive uses. The catalytic performance of the KF/CaO-MgO catalyst was attributed to the formation of active KCaF(3) and K(2)MgF(4) centers.
authors.affiliation: School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China.
authors.forename: Mingming
authors.initials: M
authors.lastname: Fan
authors.forename: Pingbo
authors.initials: P
authors.lastname: Zhang
authors.forename: Qinke
authors.initials: Q
authors.lastname: Ma
mesh_terms: D056804:Biofuels; D017610:Calcium Compounds / Q000737:chemistry*; D002384:Catalysis; D005459:Fluorides / Q000737:chemistry*; D008277:Magnesium Oxide / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017680:Potassium Compounds / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry*
chemical_list: D056804:Biofuels; D017610:Calcium Compounds; D010087:Oxides; D017680:Potassium Compounds; D008277:Magnesium Oxide; D013024:Soybean Oil; C033320:potassium fluoride; C016538:lime; D005459:Fluorides