title: A green mesostructured vanadosilicate catalyst and its unprecedented catalytic activity for the selective synthesis of 2,6-disubstituted p-benzoquinones.
abstract: We have developed a green method for the production of 2,6-disubstituted p-benzoquinones (DSBQs) by liquid-phase oxidations of di/tri-substituted phenols using two-dimensional hexagonally thick-walled mesoporous vanadosilicate catalysts. In particular, 2,6-di-tert-butyl-p-benzoquinone was synthesized by the oxidation of 2,6-di-tert-butylphenol, using various reaction parameters, over mesoporous VSBA-15 catalysts synthesized with various vanadium contents. A promising chemical treatment method for the preparation of green mesoporous VSBA-15(5) or W-VSBA-15(5) (W: washed) catalysts was successfully used in the presence of ammonium acetate solution to remove moderately toxic non-framework V2O5 crystallite species from the active surface, and the catalytic activity of the recovered green mesoporous VSBA-15(5) catalyst was determined. To confirm the green aspects, recyclability and hot-catalytic filtration experiments were performed. The combined results show that the green mesoporous VSBA-15(5) is a highly active, recyclable, and promising heterogeneous catalyst for the selective synthesis of DSBQs (98-100%), and has unprecedented catalytic activity compared with other mesoporous vanadosilicate catalysts.
authors.affiliation: School of Chemical and Biomolecular Engineering, Pusan National University, Busan 609-735, Korea. chems@pnu.edu.
authors.forename: M
authors.initials: M
authors.lastname: Selvaraj
authors.forename: S B
authors.initials: SB
authors.lastname: Park
authors.forename: J M
authors.initials: JM
authors.lastname: Kim
mesh_terms: D016227:Benzoquinones / Q000138:chemical synthesis* / Q000737:chemistry; D002084:Butylated Hydroxytoluene / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D002384:Catalysis; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry; D016062:Porosity; D012822:Silicon Dioxide / Q000138:chemical synthesis* / Q000737:chemistry*; D013696:Temperature; D017968:Vanadium Compounds / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: C513956:2,6-di-tert-butyl-4-benzoquinone; D016227:Benzoquinones; D010636:Phenols; D017968:Vanadium Compounds; D002084:Butylated Hydroxytoluene; C035407:2,6-di-tert-butylphenol; D012822:Silicon Dioxide