Journal
THERMOCHIMICA ACTA
Volume 590, Issue -, Pages 191-197Publisher
ELSEVIER
DOI: 10.1016/j.tca.2014.06.027
Keywords
Co-precipitation; Thermal treatment; Copper-containing catalysts; Volatile organic compounds; Total oxidation; Toluene
Funding
- European Regional Development Fund within the framework of the Polish Innovation Economy Operational Program [POIG.02.01.00-12-023/08]
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Copper-aluminum containing precursors with various Cu/Al molar ratios (from 0.32-1.28) were prepared by co-precipitation in the presence of ammonium carbonate. The thermal stability of the obtained materials was investigated by thermal analysis, which revealed three crucial decomposition steps, finally resulting in the formation of mixed Cu-Al oxides. The changes in structure and texture of the samples at each decomposition step were examined by X-ray diffraction (XRD), diffuse reflectance UV-vis spectroscopy (UV-vis-DRS) and low temperature sorption of nitrogen. It was found that the entire removal of structural carbonates requires a calcination temperature as high as 900 degrees C. The samples after thermal treatment at this temperature varied in the phase composition of the bulk (determined by XRD) as well as of the surface (determined by X-ray photoelectron spectroscopy). All samples contained the CuAl2O4 phase. Furthermore, an increase in Cu content led to the appearance of an increasing amount of CuO. Copper oxide in the form of relatively small crystallites turned out to be the catalytically active phase in the total oxidation of toluene. (C) 2014 Elsevier B.V. All rights reserved.
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