Journal
APPLIED CLAY SCIENCE
Volume 39, Issue 3-4, Pages 218-222Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2007.06.003
Keywords
pillared clay; bentonite; VOC oxidation
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The catalytic behavior of chromium and palladium-impregnated Al-pillared bentonite for the oxidation of aromatic VOCs, i.e. chlorobenzene or xylene, was investigated. The Cr-impregnated bentonite showed high activity for the total oxidation of cholorobenzene and xylene but the materials were completely deactivated during the reaction at 600 degrees C. Atomic absorption, XPS, XRD and TG analyses suggested three main causes for the deactivation, i.e. the loss of Cr due to the fort-nation of volatile CrO2Cl2 a strong decrease on the surface area due to the collapse of the pillars and the formation of coke. For the Pd supported pillared bentonite, the impregnation procedure completely destroyed the Al-pillars but produced a very active and stable catalyst to oxidize aromatic contaminants. However, in the case of chlorobenzene almost 20% yield of the hazardous hexachlorobenzene was obtained likely by an oxychlorination process. (C) 2007 Elsevier B.V. All rights reserved.
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