The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe 1−x Co x O 3 Perovskites
| Autor: | Ulrich Hagemann, Malte Behrens, Patrick Zeller, Markus Heidelmann, Soma Salamon, Daniel Cruz, Heiko Wende, Anna Rabe, Klaus Friedel Ortega, Axel Knop-Gericke, Nils Hartmann, Maik Dreyer, Sharif Najafishirtari, Joachim Landers, Robert Schlögl |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Chemistry – A European Journal |
| ISSN: | 1521-3765 0947-6539 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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