Phenol oxidation over iron pillared clays
K. Chellal1, F. Sadi1, K. Bachari2
1Laboratoire
2Centre
d’Etude Physico-chimiques des Matériaux et Application à l’Environnement. Faculté de Chimie. U.S.T.H.B. ALGERIE
de Recherche Scientifique et Technique en Analyses Physico-Chimiques (C.R.A.P.C.), BP 248, Alger RP 16004, Algeria
(*) corresponding author: kchellal@yahoo.fr
Abstract
A series of pillared interlayered clays including aluminum and iron has been prepared. Iron
exchanged and/or post-pillared clays with Al-Fe solutions have been synthesized with
different hydrolysis ratio OH/Metal. These solids have been characterized by XRD and N2
adsorption measurements and tested in the CWPO of aqueous phenol using hydrogen
peroxide (30%) as an oxidant under mild reaction conditions. The cooling at 4°C of clay
before pillaring increases the basal space from 17.3A° to 18.10A° in the case of aluminum.
Iron exchanged before pillaring increases the rate of iron to 15.8% The catalytic tests show
that natural clay and aluminum pillared clay MR-Al100 (OH)1.2 are not active despite they
have iron ions. Iron exchanged and post-pillared clay with mixed (Al-Fe) solution containing
10% of iron expressed as molar percentage Fe/MR- Al90Fe10(OH)1.2 show 91.5% of phenol
conversion, more than 70% of TOC abatement after 12h of reaction and the low iron leaching
(0.02%) in the solution.
Keyword: Clay, (Fe-Al) pillared clay, Phenol oxidation, Hydrogen peroxide.