Dodecatungstocobaltate supported over ZSM-5 zeolite as novel solid catalyst in selective sulfide oxidation

CLARA SAUX, CANDELARIA LEAL MARCHENA, LILIANA B. PIERELLA; LUIS R. PIZZIO

JOURNAL OF POROUS MATERIALS

SPRINGER

Lugar: Berlin; Año: 2016

1380-2224

The catalytic behavior of a Keggin type potassiumdodecatungstocobaltate (II) salt supported on ZSM-5zeolite for wet peroxide oxidation of 2-(methylthio)benzothiazole,as a model organic sulfide, was thoroughlystudied. Microporous ZSM-5 zeolite was obtained by thehydrothermal crystallization method. The Keggin salt wasincorporated in the MFI zeolite matrix by the wet impregnationmethod followed by calcination at 350 C. Catalystswere further characterized by X ray diffraction, UV?Visdiffuse reflectance spectroscopy and scanning electronmicroscopy-EDAX techniques. Supported and bulk Keggindodecatungstocobaltate (II) were compared with pureH-ZSM-5 zeolite as catalysts for the sulfide oxidation. Whenthe reaction was not catalyzed, just a 9 mol% of sulfideconversion was obtained. Reaction parameters, such asnature of the solvent, hydrogen peroxide concentration,reaction time, catalyst mass, substrate initial concentrationand reaction temperature, were evaluated to reach the optimumreaction conditions, considering substrate conversion