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Type: Artigo de periódico
Title: Catalysts based on clay and iron oxide for oxidation of toluene
Author: Nogueira, FGE
Lopes, JH
Silva, AC
Lago, RM
Fabris, JD
Oliveira, LCA
Abstract: Two samples of heterogeneous catalysts were prepared by impregnating a raw-clay, a montmorillonite-rich material, with iron oxides, in order to be used in oxidative reactions of toluene. The starting clay-sample was collected from a pedon in the region of San Juan, Argentina. All catalysts were characterized with X-ray powder diffraction (XRD), infrared spectroscopy, temperature programmed reduction (TPR), scanning electron microscopy with energy dispersive X-ray analysis (SEM/EDS), and specific surface area measurements. After impregnating the raw clay material with iron oxides, there was a collapse of basal plane spacing and an increase in surface area, from 17 to 62 m(2) g(-1) of montmorillonite. The TPR, EDS, and XRD results evidenced that the dispersion of iron-containing species depended on how the impregnation was made. The catalyst with higher exposure to iron oxides on sample preparation presented a higher catalytic activity on toluene oxidation. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Modified clay
Iron oxide
Country: Holanda
Editor: Elsevier Science Bv
Citation: Applied Clay Science. Elsevier Science Bv, v. 51, n. 3, n. 385, n. 389, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.clay.2010.12.007
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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