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J Hazard Mater

Title:		Reutilization of Cr-Y zeolite obtained by biosorption in the catalytic oxidation of volatile organic compounds
Author(s):		Silva B; Figueiredo H; Santos VP; Pereira MF; Figueiredo JL; Lewandowska AE; Banares MA; Neves IC; Tavares T;
Address:		"IBB - Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. bsilva@deb.uminho.pt"
Journal Title:		J Hazard Mater
Year:		2011
Volume:		20110523
Issue:		2
Page Number:		545 - 553
DOI:		10.1016/j.jhazmat.2011.05.056
ISSN/ISBN:		1873-3336 (Electronic) 0304-3894 (Linking)
Abstract:		"This work aims at the reutilization of a Cr-loaded NaY zeolite obtained by biorecovery of chromium from water as catalyst in the oxidation of volatile organic compounds (VOC). Cr-NaY catalysts were obtained after biosorption of Cr(VI) using a bacterium, Arthrobacter viscosus, supported on the zeolite. The biosorption experiments were conducted at different pH values in the range 1-4. The catalysts were characterized by several techniques, namely ICP-AES, SEM-EDS, XRD, XPS, Raman, H(2)-TPR and N(2) adsorption. The zeolite obtained at pH 4 has the highest content of chromium, 0.9%, and was selected as the best catalyst for the oxidation of different VOC, namely ethyl acetate, ethanol and toluene. For all VOC tested, the catalyst with chromium showed higher activity and selectivity to CO(2), in comparison with the starting zeolite NaY. The presence of chromium shifted also the reaction pathways. In terms of selectivity to CO(2), the following sequence was observed: ethyl acetate>toluene>ethanol"
Keywords:		"Catalysis Chromium/*chemistry Microscopy, Electron, Scanning Oxidation-Reduction Spectrum Analysis Volatile Organic Compounds/*chemistry Yttrium/*chemistry Zeolites/*chemistry;"
Notes:		"MedlineSilva, B Figueiredo, H Santos, V P Pereira, M F R Figueiredo, J L Lewandowska, A E Banares, M A Neves, I C Tavares, T eng Research Support, Non-U.S. Gov't Netherlands 2011/06/21 J Hazard Mater. 2011 Aug 30; 192(2):545-53. doi: 10.1016/j.jhazmat.2011.05.056. Epub 2011 May 23"