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LDH-derived catalysts for complete oxidation of volatile organic compounds

Published online by Cambridge University Press:  09 July 2018

K. Bahranowski ,
E. Bielańska ,
R. Janik ,
T. Machej  and
E. M. Serwicka
K. Bahranowski
Affiliation:
Faculty of Geology, Geophysics and Environmental Protection, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Kraków, Poland
E. Bielańska
Affiliation:
Institute of Metallurgy and Material Chemistry, Polish Academy of Sciences, ul. Reymonta 9, 30-059 Kraków, Poland
R. Janik
Affiliation:
Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 1, 30-239 Kraków, Poland
T. Machej
Affiliation:
Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 1, 30-239 Kraków, Poland
E. M. Serwicka*
Affiliation:
Faculty of Geology, Geophysics and Environmental Protection, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Kraków, Poland
*
1Author for correspondence
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Abstract

The Cu,Cr-, Zn,Cr- and Cu,Al-layered double hydroxides have been synthesized by the coprecipitation method and characterized by elemental analysis, PXRD, SEM/EDS and BET. The mixed oxide materials obtained upon calcination at 873 K show very high catalytic activity for the combustion of toluene and ethanol. The best sample is derived from the Cu,Cr-LDH precursor with a Cu:Cr ratio of 2, composed of copper oxide and copper chromite. This catalyst gave 50% conversion of toluene and ethanol at temperatures of 45 and 15 K lower, respectively, than the reference commercial catalyst. Catalytic tests with a mechanical mixture of CuO and CuCr2O4 demonstrate that the use of an LDH precursor is essential for optimum results. The importance of the simultaneous presence of both Cu and Cr, the influence of the Cu:Cr ratio on the catalytic activity and the role of the interface boundaries in the CuO-CuCr2O4 mixed oxide system are discussed.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 1 , March 1999 , pp. 67 - 77
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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