Cobalt-copper oxide catalysts for VOC abatement: effect of Co:Cu ratio on performance in ethanol oxidation

0566710 - ÚCHP 2024 RIV CH eng J - Journal Article
Kupková, K. - Topka, Pavel - Balabánová, Jana - Koštejn, Martin - Jirátová, Květa - Giraudon, J.-M. - Lamonier, J.-F. - Maixner, J. - Kovanda, F.
Cobalt-copper oxide catalysts for VOC abatement: effect of Co:Cu ratio on performance in ethanol oxidation.
Catalysts. Roč. 13, č. 1 (2023), č. článku 107. E-ISSN 2073-4344
R&D Projects: GA ČR(CZ) GA21-04477S
Institutional support: RVO:67985858
Keywords : cobalt-copper oxide catalysts * synergistic effect * ethanol total oxidation * VOC abatement
OECD category: Chemical process engineering
Impact factor: 3.9, year: 2022
Method of publishing: Open access
https://www.mdpi.com/2073-4344/13/1/107

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.
Permanent Link: https://hdl.handle.net/11104/0338013