The Effect of Water on the 2‐Propanol Oxidation Activity of Co‐Substituted LaFe₁₋Co_xO₃ Perovskites.

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; Knop‐Gericke, Axel; Schlögl, Robert; Behrens, Malte

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.

OXIDATION of water; GAS phase reactions; CATALYST poisoning; METHYLAMMONIUM; PROPANOLS

Chemistry - A European Journal, 2021, Vol 27, Issue 68, p17127

0947-6539

Academic Journal

10.1002/chem.202102791