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Received April 13, 2014
Accepted July 14, 2014
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Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method
1Laboratoire de Physico-chimie des Matériaux Minéraux et Leurs Applications, Centre National des Recherches en Sciences des Matériaux, Technopole Borj Cédria, BP 95-2050 Hammam Lif, Tunisia 2Départements de Chimie, Faculté des Sciences de Tunis, 1060 Tunis, Tunisia
saidamnasri@gmail.com
Korean Journal of Chemical Engineering, January 2015, 32(1), 68-73(6), 10.1007/s11814-014-0204-2
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Abstract
Preparation, characterization and catalytic activity of Zr-and Ce-Zr pillared clays with different method (direct, indirect, and under reflux), starting from Tunisian interstratified illite-smectite bentonite, are described. Zirconium pillared clays (Zr-PILC) revealed weaker thermal stability. To overcome this drawback, the addition of cerium (Ce) as the second metal component to Zr-PILC was attempted. Wet peroxide oxidation of phenol from industrial wastewaters was carried out over these catalysts. The catalysts were very efficient in the phenol oxidation reaction in diluted aqueous medium under mild experimental conditions (298 K and atmospheric pressure). The addition of Ce in the synthesis step of the inorganic polycations yielded a favorable effect on the pillaring of the materials, allowing the increase of the basal spacing and enhancing the catalytic activity of the solids. The pillared clays were characterized by XRD, chemical analysis, CEC, and N2 adsorption to 77 K. The acidity of the pillared clays was calculated from the adsorbed n-butyl amine.
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Sanabria NR, Centeno MA, Molina R, Moreno S, Appl. Catal. A: Gen., 356(2), 243 (2009)
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Yin YG, Research methods of heterogeneous catalysts, chemical industry, Press, Beijing, 582 (1988)
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