NIOBIUM-DOPED PHOSPHOMOLYBDIC ACID CATALYST INCLUDED IN SILICA MATRIX: STUDY OF STABILITY AND REACTIVITY USING DIFFERENT LOADS

MIGLIORERO, M. B. COLOMBO; PALERMO, V.; ROMANELLI, G.P.; VÁZQUEZ, P.G.

LATIN AMERICAN APPLIED RESEARCH

Plapiqui

Lugar: Bahia Blanca; Año: 2023 vol. 53 p. 49 - 54

0327-0793

Heteropolyacids are used as catalysts in numerous reactions because they are inexpensive, nontoxic, have high acid strength and excellent redox properties. They have been used as acid catalyst in different ways, and numerous studies indicate that the incorporation of Nb into the structure of a solid gen-erates an increase in the acidity of the sample, both at Lewis and Brönsted acid sites. Heteropolyacids have low surface area, which makes it necessary to include them in a support to increase the surface area and al-low their use as heterogeneous catalysts in liquid phase reactions because they are very soluble in polar solvents. In this work, the synthesis of catalysts con-taining a niobium-doped heteropolyacid (PMoNb) in-cluded in silica at different concentrations is reported. The catalysts were characterized by ICP-MS, FT-IR, XRD, potentiometric titration, and their catalytic ac-tivity was tested in the selective oxidation of diphenyl sulfide to diphenyl sulfoxide, showing excellent re-sults.