A natural kaolinite from Argentinean deposits, converted into metakaolin by thermal treatment at 823 K and chemically modified, was used as a support for catalysts containing iso- and heteropolyanions (POMs and HPOMs) such as ammonium heptamolybdate (AHM) and ammonium Anderson phases [XMo6O24H6](3-) [X(III) = Al, Co]. The catalytic performances were analyzed in the clean selective oxidation of diphenyl sulfide (DPS) with H2O2, The chemical modification included treatment in acid solution and functionalization with 3-(aminopropyl)trimethoxysilane (F). The characterization was carried out by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), FTIR and Raman spectroscopies. Textural properties were determined by N-2 adsorption-desorption isotherms (BET method); surface acid properties (Bronsted and Lewis surface acid sites) were measured by FTIR of adsorbed pyridine. A noticeable increase of surface areas and chemical composition change of the support occurred by acid treatment. Functionalization with amino-siliceous agents yielded an appropriate surface for the adsorption of POMs and HPOMs. The system containing Mo presented conversions of diphenyl sulfide of around 90% and high selectivity to diphenyl sulfone near 95%. (C) 2017 Elsevier B.V. All rights reserved.

Molybdenum-containing systems based on natural kaolinite as catalysts for selective oxidation of aromatic sulfides / Mu ̃noz, Mercedes; Gallo, María A.; Gutiérrez-Alejandre, Aída; Gazzoli, Delia; Cabello, Carmen I.. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - STAMPA. - 219:(2017), pp. 683-692. [10.1016/j.apcatb.2017.08.007]

Molybdenum-containing systems based on natural kaolinite as catalysts for selective oxidation of aromatic sulfides

Gazzoli, Delia
Writing – Original Draft Preparation
;
Cabello, Carmen I.
Membro del Collaboration Group
2017

Abstract

A natural kaolinite from Argentinean deposits, converted into metakaolin by thermal treatment at 823 K and chemically modified, was used as a support for catalysts containing iso- and heteropolyanions (POMs and HPOMs) such as ammonium heptamolybdate (AHM) and ammonium Anderson phases [XMo6O24H6](3-) [X(III) = Al, Co]. The catalytic performances were analyzed in the clean selective oxidation of diphenyl sulfide (DPS) with H2O2, The chemical modification included treatment in acid solution and functionalization with 3-(aminopropyl)trimethoxysilane (F). The characterization was carried out by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), FTIR and Raman spectroscopies. Textural properties were determined by N-2 adsorption-desorption isotherms (BET method); surface acid properties (Bronsted and Lewis surface acid sites) were measured by FTIR of adsorbed pyridine. A noticeable increase of surface areas and chemical composition change of the support occurred by acid treatment. Functionalization with amino-siliceous agents yielded an appropriate surface for the adsorption of POMs and HPOMs. The system containing Mo presented conversions of diphenyl sulfide of around 90% and high selectivity to diphenyl sulfone near 95%. (C) 2017 Elsevier B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1015243
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