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Catalytic wet peroxide oxidation of phenol over Ce-Zr-modified clays: Effect of the pillaring method
Saida Mnasri-Ghnimi,N. Frini-Srasra 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.1
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. Zirco-nium 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 industrialwastewaters was carried out over these catalysts. The catalysts were very efficient in the phenol oxidation reaction indiluted aqueous medium under mild experimental conditions (298 K and atmospheric pressure). The addition of Ce inthe synthesis step of the inorganic polycations yielded a favorable effect on the pillaring of the materials, allowing theincrease of the basal spacing and enhancing the catalytic activity of the solids. The pillared clays were characterized byXRD, chemical analysis, CEC, and N2 adsorption to 77 K. The acidity of the pillared clays was calculated from theadsorbed n-butyl amine.