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J Chromatogr A

Title:		Characterization of ceria-zirconia mixed oxides as catalysts for the combustion of volatile organic compounds using inverse gas chromatography
Author(s):		Diaz E; de Rivas B; Lopez-Fonseca R; Ordonez S; Gutierrez-Ortiz JI;
Address:		"Department of Chemical and Environmental Engineering, University of Oviedo, Julian Claveria s/n, 33006 Oviedo, Spain"
Journal Title:		J Chromatogr A
Year:		2006
Volume:		20060403
Issue:		1-Feb
Page Number:		230 - 239
DOI:		10.1016/j.chroma.2006.03.043
ISSN/ISBN:		0021-9673 (Print) 0021-9673 (Linking)
Abstract:		"Inverse gas chromatography (IGC) has been used in this work for characterizing the adsorption of different volatile organic compounds (VOCs) (1,2-dichloroethane (DCE), trichloroethylene (TCE), and n-hexane) over ceria-zirconia mixed oxides (Ce(x)Zr(1-x)O2, with x = 0, 0.15, 0.5, 0.68, 0.8 and 1). These materials have shown to be very active catalysts for the deep oxidation of the studied VOCs in previous papers. The enthalpies of adsorption (-deltaH(ads)), adsorption isotherms (corresponding to the Henry region), and dispersive (gamma(s)(D)) and specific (I(sp)) components of the surface energy for the adsorption of the investigated compounds are determined using IGC at infinite dilution. These chromatographic data and other surface parameters (surface area, oxygen storage capacity, surface acidity, and reducibility) are correlated with the activity and selectivity of these catalysts. As a result, for n-hexane, the catalytic activity is mainly correlated with the adsorption capacity of the solids, whereas the activity for chlorinated compounds oxidation (as well as the selectivity to oxidation products) depends on both oxygen storage capacity and specific interaction of the chlorinated compound with the surface"
Keywords:		"Adsorption Catalysis Cerium/*chemistry Chromatography, Gas/*methods Organic Chemicals/*chemistry Volatilization Zirconium/*chemistry;"
Notes:		"MedlineDiaz, Eva de Rivas, Beatriz Lopez-Fonseca, Ruben Ordonez, Salvador Gutierrez-Ortiz, Jose I eng Netherlands 2006/04/04 J Chromatogr A. 2006 May 26; 1116(1-2):230-9. doi: 10.1016/j.chroma.2006.03.043. Epub 2006 Apr 3"