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The Effect of Water on the 2-Propanol Oxidation Activity of Co-Substituted LaFe1−CoxO3 Perovskites

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Cruz,  Daniel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion;

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Zeller,  Patrick
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, BESSY II, Department of Catalysis for Energy;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion;

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chem.202102791.pdf
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Citation

Dreyer, M., Cruz, D., Hagemann, U., Zeller, P., Heidelmann, M., Salamon, S., et al. (2021). The Effect of Water on the 2-Propanol Oxidation Activity of Co-Substituted LaFe1−CoxO3 Perovskites. Chemistry – A European Journal. doi:10.1002/chem.202102791.


Cite as: http://hdl.handle.net/21.11116/0000-0009-863A-F
Abstract
Perovskites are interesting oxidation catalysts due to their chemical flexibility enabling the tuning of several properties. In this work, we synthesized LaFe1−xCoxO3 catalysts by co-precipitation and thermal decomposition, characterized them thoroughly and studied their 2-propanol oxidation activity under dry and wet conditions to bridge the knowledge gap between gas and liquid phase reactions. Transient tests showed a highly active, unstable low-temperature (LT) reaction channel in conversion profiles and a stable, less-active high-temperature (HT) channel. Cobalt incorporation had a positive effect on the activity. The effect of water was negative on the LT channel, whereas the HT channel activity was boosted for x > 0.15. The boost may originate from a slower deactivation rate of the Co3+ sites under wet conditions and a higher amount of hydroxide species on the surface comparing wet to dry feeds. Water addition resulted in a slower deactivation for Co-rich catalysts and higher activity in the HT channel state.