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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Vydáno v:	Catalysts Ročník 13; číslo 1; s. 107
Hlavní autoři:	Kupková, Květa, Topka, Pavel, Balabánová, Jana, Koštejn, Martin, Jirátová, Květuše, Giraudon, Jean-Marc, Lamonier, Jean-Francois, Maixner, Jaroslav, Kovanda, František
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Basel MDPI AG 01.01.2023 MDPI
Edice:	Catalysts
Témata:	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
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Abstract	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.
AbstractList	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. 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. L'effet de la composition des catalyseurs à base d'oxyde de Co-Cu sur leurs propriétés physicochimiques et leur performance dans l'oxydation profonde de l'éthanol a été étudié. Les catalyseurs avec des rapports molaires Co:Cu de 4:1, 1:1 et 1:4 ont été obtenus par calcination (4 h à 500 °C dans l'air) des précurseurs coprécipités et caractérisés en détail à l'aide de la XRD des poudres, de la spectroscopie Raman, de la physisorption de N2, de la H2-TPR et de la XPS. La DRX des poudres et la spectroscopie Raman ont indiqué la formation de mélanges de Co3O4 et de CuO plutôt que d'oxydes mixtes Co-Cu. Le CuO a favorisé la réduction du Co3O4 ; les catalyseurs Co-Cu ont été réduits plus facilement que les oxydes de Co et de Cu à composant unique et les principaux maxima de réduction ont été déplacés vers des températures plus basses avec l'augmentation de la teneur en cobalt dans les catalyseurs. Le catalyseur à base d'oxyde de Co-Cu avec un rapport molaire Co:Cu de 4:1 a présenté les meilleures performances dans l'oxydation de l'éthanol en phase gazeuse, affichant les températures T50 (91 °C) et T90(CO2) (159 °C) les plus basses nécessaires à la conversion de 50 % de l'éthanol et à la conversion de 90 % en CO2, respectivement. Les excellentes propriétés catalytiques de ce catalyseur à base d'oxyde de Co-Cu ont été attribuées à l'effet synergique des composants Co et Cu. L'activité et la sélectivité élevées du catalyseur Co-Cu ont été attribuées à la présence de particules de CuO finement dispersées à la surface du Co3O4.
Author	Koštejn, Martin Lamonier, Jean-Francois Kovanda, František Topka, Pavel Maixner, Jaroslav Kupková, Květa Giraudon, Jean-Marc Jirátová, Květuše Balabánová, Jana
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Snippet	The effect of the Co-Cu oxide catalysts composition on their physicochemical properties and performance in the deep oxidation of ethanol was studied. The...
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SubjectTerms	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
Title	Cobalt-Copper Oxide Catalysts for VOC Abatement: Effect of Co:Cu Ratio on Performance in Ethanol Oxidation
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