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The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe 1−x Co x O 3 Perovskites
Author(s) -
Dreyer Maik,
Cruz Daniel,
Hagemann Ulrich,
Zeller Patrick,
Heidelmann Markus,
Salamon Soma,
Landers Joachim,
Rabe Anna,
Ortega Klaus Friedel,
Najafishirtari Sharif,
Wende Heiko,
Hartmann Nils,
KnopGericke Axel,
Schlögl Robert,
Behrens Malte
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102791
Subject(s) - catalysis , cobalt , chemistry , decomposition , metal , precipitation , inorganic chemistry , hydroxide , propanol , thermal decomposition , chemical engineering , materials science , organic chemistry , methanol , physics , meteorology , engineering
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.