The nature of low temperature deactivation of CoCr2O4 and CrOx/-Al2O3 catalysts for the oxidative decomposition of trichloroethylene

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The CoCr2O4 and CrOx/gamma-Al2O3 catalysts were used for the oxidative decomposition of trichloroethylene (TCE). Both catalysts showed an initial deactivation at low temperatures around 280degreesC, mainly due to the dissociative adsorption of reactant TCE. This was confirmed by the temperature programmed oxidation of TCE where the carbon oxides were formed up to a temperature below 300degreesC. Possible changes in the oxidation state of chromium species were observed with XANES and ESR. During the oxidation reaction at low temperatures, the Cr(VI) species were reduced to Cr(III) species, which seemed to be coupled with TCE adsorption. At higher temperatures, however, the Cr(VI) species appeared again and the catalytic activity was completely recovered. (C) 2003 Elsevier B.V. All rights reserved.
Publisher
Elsevier Science Bv
Issue Date
2003-11
Language
English
Article Type
Article; Proceedings Paper
Keywords

HYDROCARBONS; VOCS

Citation

CATALYSIS TODAY, v.87, no.1, pp.29 - 34

ISSN
0920-5861
URI
http://hdl.handle.net/10203/3535
Appears in Collection
CBE-Journal Papers(저널논문)
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