Journal
APPLIED CATALYSIS A-GENERAL
Volume 334, Issue 1-2, Pages 168-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2007.09.047
Keywords
pillared clay; phenol oxidation; wastewater treatment; Al-Ce-Fe polyoxocation
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This work describes the synthesis and characterization by XRD of pillaring species in solid state, obtained from Al or Al-Ce-Fe polyhydroxocationic solutions, the modification of a bentonite via pillaring by ionic exchange with such solutions and the catalytic activity of the pillared clays in the phenol oxidation reaction in diluted aqueous medium with hydrogen peroxide. Results indicate the formation of boehmite from the Al3+ polyhydroxocationic solution and the presence of three different crystalline structures (boehmite, alpha-Fe2O3 and CeO2) into the solid synthesized from the Al-Ce-Fe polyhydroxocationic solution. The EPR analysis confirms the formation of iron oxide particles and the likely inclusion of isolated Fe 31 species into the alumina matrix. On the other hand, the clay modified with Al-Ce-Fe is a very active (100% of phenol conversion in the first hour of reaction) and selective (55% of selectivity to COD catalyst in the total oxidation of phenol, at 20 degrees C and atmospheric pressure. (c) 2007 Elsevier B.V. All rights reserved.
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