title: Efficient bifunctional catalyst lipase/organophosphonic acid-functionalized silica for biodiesel synthesis by esterification of oleic acid with ethanol.
abstract: An efficient bifunctional catalyst lipase/organophosphonic acid-functionalized silica (SG-T-P-LS) has been successfully developed, and biodiesel production of fatty acid ethyl ester (FAEE) from free fatty acid (FFA) oleic acid with short-chain alcohol ethanol catalyzed by SG-T-P-LS was investigated. The process optimization using response surface methodology (RSM) was performed and the interactions between the operational variables were elucidated, and it was found that the molar ratio of alcohol to acid was the most significant factor. The optimum values for maximum conversion ratio can be obtained by using a Box-Behnken center-united design, and the conversion ratio could reach 89.94 ± 0.42% under the conditions that ethanol/acid molar ratio was 1.05:1 and SG-T-P-LS to FFA weight ratio was 14.9 wt.% at 28.6°C. The research results show that SG-T-P and LS-20 could work cooperatively to promote the esterification reaction, and the bifunctional catalyst SG-T-P-LS is a potential catalyst for biodiesel production.
authors.affiliation: School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China. yinping426@163.com
authors.forename: Ping
authors.initials: P
authors.lastname: Yin
authors.forename: Wen
authors.initials: W
authors.lastname: Chen
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Hou
authors.initials: H
authors.lastname: Chen
authors.forename: Rongjun
authors.initials: R
authors.lastname: Qu
authors.forename: Xiguang
authors.initials: X
authors.lastname: Liu
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Tang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xu
mesh_terms: D000704:Analysis of Variance; D055162:Biocatalysis; D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D004951:Esterification; D000431:Ethanol / Q000737:chemistry*; D008049:Lipase / Q000378:metabolism*; D008855:Microscopy, Electron, Scanning; D008962:Models, Theoretical; D019301:Oleic Acid / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D056804:Biofuels; D063065:Organophosphonates; D019301:Oleic Acid; D000431:Ethanol; D012822:Silicon Dioxide; D008049:Lipase