title: Direct oxidation of n-heptane to ester over modified sulfated SnO2 catalysts under mild conditions.
abstract: The direct oxidation of n-heptane to ester using air as the oxidant under mild conditions assisted by sulfated tin oxide (SO(4)(2-)/SnO(2)) and Co modified sulfated tin oxide (SO(4)(2-)/SnO(2)-Co(2)O(3)) prepared by chemical co-precipitation method and characterized by means of SEM, XRD, FT-IR and XPS techniques was studied. From the results it was found that the catalytic activity of SO(4)(2-)/SnO(2)-Co(2)O(3) is higher than that of SO(4)(2-)/SnO(2) in this target reaction, and two asymmetric esters: diisobutyl phthalate and cyclohexylmethyl tridecyl oxalate that have not been reported in the directly oxidation of n-heptane by traditional method have been obtained. The possible mechanism was also discussed.
authors.affiliation: Institute of Energy-Chemistry, College of Chemistry and Materials Science, Shaanxi Normal University, 710062 Xi'an, PR China.
authors.forename: Xue
authors.initials: X
authors.lastname: Cui
authors.forename: Hongzhu
authors.initials: H
authors.lastname: Ma
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Hongwei
authors.initials: H
authors.lastname: Chen
mesh_terms: D002384:Catalysis; D003993:Dibutyl Phthalate / Q000031:analogs & derivatives / Q000737:chemistry; D004952:Esters / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006536:Heptanes / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D013431:Sulfates / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D004952:Esters; D006536:Heptanes; D013431:Sulfates; D017971:Tin Compounds; D003993:Dibutyl Phthalate; C028618:n-heptane; C025605:diisobutyl phthalate; C045358:stannic oxide