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Liquid-phase selective oxidation of 2-methylnaphtalene to the vitamin K 3 was investigated on a series of mesostructured vanadia–alumina catalysts with different V/Al ratios (0.1–1). They were prepared by the co-precipitation of ammonium metavanadate and aluminum nitrate at pH 5 and characterized by XRD, Raman, TG–DTA, elemental analysis and adsorption-desorption isotherms of nitrogen at −196°C...