title: Transesterification of sunflower oil to biodiesel on ZrO2 supported La2O3 catalyst.
abstract: ZrO(2) supported La(2)O(3) catalyst prepared by impregnation method was examined in the transesterification reaction of sunflower oil with methanol to produce biodiesel. It was found that the catalyst with 21 wt% loaded La(2)O(3) and calcined at 600 degrees C showed the optimum activity. The basic property of the catalyst was studied by CO(2)-TPD, and the results showed that the fatty acid methyl ester (FAME) yield was related to their basicity. The catalyst was also characterized by TG-DTA, XRD, FTIR, SEM and TEM, and the mechanism for the formation of basic sites was discussed. It was also found that the crystallite size of support ZrO(2) decreased by loading of La(2)O(3), and the model of the solid-state reaction on the surface of La(2)O(3)/ZrO(2) catalyst was proposed. Besides, the influence of various reaction variables on the conversion was investigated.
authors.affiliation: Department of Chemistry, Institute of Catalysis, Zhejiang University, Hangzhou 310028, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Sun
authors.forename: Yuqi
authors.initials: Y
authors.lastname: Ding
authors.forename: Jinzhao
authors.initials: J
authors.lastname: Duan
authors.forename: Qijun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Lou
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Zheng
mesh_terms: D056804:Biofuels; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis; D002627:Chemistry, Physical / Q000379:methods; D003247:Conservation of Natural Resources / Q000379:methods; D003460:Crystallization; D004951:Esterification; D007811:Lanthanum / Q000737:chemistry*; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D000074242:Sunflower Oil; D013696:Temperature; D014961:X-Ray Diffraction; D015040:Zirconium / Q000737:chemistry*
chemical_list: D056804:Biofuels; D010087:Oxides; D010938:Plant Oils; D000074242:Sunflower Oil; D002245:Carbon Dioxide; C103829:lanthanum oxide; D007811:Lanthanum; D015040:Zirconium; C028541:zirconium oxide