Mo-based Keggin heteropolyacids as catalysts in the green and selective oxidation of diphenyl sulfide

PALERMO, VALERIA; G.P. ROMANELLI; P.G. VÁZQUEZ.

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2013 p. 142 - 150

1381-1169

Heteropolyacids are used as redox catalysts due to their bifunctional properties. Among some advantages over conventional catalysts their selectivity, easy isolation and reuse can be emphasized. In homogeneous conditions the isolation and recycling can be harder, because of that they are supported for their use as heterogeneous catalysts. In this work, we compare the catalytic activity of different heteropolyacids with Keggin structure, supported on pure and functionalized silica (with 3-aminopropyltrimethoxysilane). H6PMo11BO40, H6PMo11BiO40, H6PMo11LaO40, and H6PMo11YO40 were synthesized, supported and characterized by several physicochemical techniques. Highly selective results were obtained in the selective oxidation of diphenyl sulfide to diphenyl sulfoxide or diphenyl sulfone. Besides, these catalysts could be reused. The above-mentioned reaction is useful due to the importance of these compounds as intermediates in the synthesis of biologically significant molecules.