Cobalt-Copper Oxide Catalysts for VOC Abatement: Effect of Co:Cu Ratio on Performance in Ethanol Oxidation

The effect of the Co-Cu oxide catalysts composition on their physicochemical properties and performance in the deep oxidation of ethanol was studied. The catalysts with Co:Cu molar ratios of 4:1, 1:1, and 1:4 were obtained by calcination (4 h at 500 °C in air) of the coprecipitated precursors and ch...

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Bibliographic Details
Published in:Catalysts Vol. 13; no. 1; p. 107
Main Authors: Kupková, Květa, Topka, Pavel, Balabánová, Jana, Koštejn, Martin, Jirátová, Květuše, Giraudon, Jean-Marc, Lamonier, Jean-Francois, Maixner, Jaroslav, Kovanda, František
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.01.2023
MDPI
Series:Catalysts
Subjects:
Air pollution
Carbon dioxide
Catalysis
Catalysts
Catalytic converters
Chemical reactions
Chemical Sciences
Cobalt oxides
Conversion
Copper
Copper oxides
Cost control
Ethanol
Expected values
Metal oxides
Mixed oxides
Nitrates
Oxidation
Raman spectroscopy
Ratios
Reduction
Selectivity
Stainless steel
Synergistic effect
VOCs
Volatile organic compounds
X ray photoelectron spectroscopy
ISSN:2073-4344, 2073-4344
Online Access:Get full text
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Summary:The effect of the Co-Cu oxide catalysts composition on their physicochemical properties and performance in the deep oxidation of ethanol was studied. The catalysts with Co:Cu molar ratios of 4:1, 1:1, and 1:4 were obtained by calcination (4 h at 500 °C in air) of the coprecipitated precursors and characterized in detail using powder XRD, Raman spectroscopy, N2 physisorption, H2-TPR, and XPS. The powder XRD and Raman spectroscopy indicated the formation of Co3O4 and CuO mixtures rather than Co-Cu mixed oxides. The CuO promoted the Co3O4 reduction; the Co-Cu catalysts were reduced more easily than the single-component Co and Cu oxides and the main reduction maxima were shifted to lower temperatures with increasing cobalt content in the catalysts. The Co-Cu oxide catalyst with a Co:Cu molar ratio of 4:1 exhibited the best performance in ethanol gas-phase oxidation, showing the lowest T50 (91 °C) and T90(CO2) (159 °C) temperatures needed for 50% ethanol conversion and 90% conversion to CO2, respectively. The excellent catalytic properties of this Co-Cu oxide catalyst were ascribed to the synergistic effect of Co and Cu components. The high activity and selectivity of the Co-Cu catalyst was attributed to the presence of finely dispersed CuO particles on the surface of Co3O4.
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ISSN:2073-4344
2073-4344
DOI:10.3390/catal13010107