The Effect of Water on the 2-Propanol Oxidation Activity of Co-Substituted LaFe 1- Co x O 3 Perovskites.

Autor: Dreyer M; Faculty for Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 7, 45141, Essen, Germany., Cruz D; Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.; Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr, 45470, Germany., Hagemann U; Interdisciplinary Center for Analytics on the Nanoscale (ICAN), NanoEnergieTechnikZentrum at University of Duisburg-Essen, Carl-Benz-Str. 199, 47057, Duisburg, Germany., Zeller P; Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.; Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, BESSY II, Department of Catalysis for Energy, Albert-Einstein-Straße 15, 12489, Berlin, Germany., Heidelmann M; Interdisciplinary Center for Analytics on the Nanoscale (ICAN), NanoEnergieTechnikZentrum at University of Duisburg-Essen, Carl-Benz-Str. 199, 47057, Duisburg, Germany., Salamon S; Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany., Landers J; Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany., Rabe A; Faculty for Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 7, 45141, Essen, Germany., Ortega KF; Institute of Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany., Najafishirtari S; Faculty for Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 7, 45141, Essen, Germany., Wende H; Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany., Hartmann N; Interdisciplinary Center for Analytics on the Nanoscale (ICAN), NanoEnergieTechnikZentrum at University of Duisburg-Essen, Carl-Benz-Str. 199, 47057, Duisburg, Germany., Knop-Gericke A; Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.; Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr, 45470, Germany., Schlögl R; Department of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.; Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr, 45470, Germany., Behrens M; Faculty for Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstr. 7, 45141, Essen, Germany.; Institute of Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118, Kiel, Germany.
Jazyk: angličtina
Zdroj: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2021 Dec 06; Vol. 27 (68), pp. 17127-17144. Date of Electronic Publication: 2021 Nov 08.
DOI: 10.1002/chem.202102791
Abstrakt: Perovskites are interesting oxidation catalysts due to their chemical flexibility enabling the tuning of several properties. In this work, we synthesized LaFe 1-x Co x O 3 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 Co 3+ 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.
(© 2021 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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