Tailoring the metal-perovskite interface for promotional steering of the catalytic NO reduction by CO in the presence of H2O on Pd-lanthanum iron manganite composites

Mohammadi, Asghar ¹Farzi, Ali ¹Thurner, Christoph ²Kloetzer, Bernhard ²Schwarz, Sabine ³Bernardi, Johannes ³Niaei, Aligholi ¹Penner, Simon²

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作者信息

1. Univ Tabriz
2. Univ Innsbruck
3. Tech Univ Wien
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Abstract

We steer the catalytic performance and morphology of Pd - lanthanum iron manganite (LFM) perovskite interfaces towards optimum NO+CO reactivity in presence of water by following different preparation approaches. Strong CO adsorption for samples without Pd-perovskite interface acts as an inhibitor for adsorption/dissociation of NO, while samples with an extended interface, additionally aided by H2O, show reduced CO poisoning. The optimized use of lattice oxygen for CO oxidation at the phase boundary and its replenishment from NO dissociation allows for the formation of more poisoning-resistant active sites for NO activation. Reaction of species from H2O dissociation with adsorbed CO assists further surface clean off. Enhanced NO reduction activity on the "de-poisoned" interface leads to a pronounced increase in N-2 selectivity. Preferred production of NH3 at low NO and high CO and H2O concentration indicates that water gas shift intermediates are linked to increased surface hydrogen activity and increased NH3 formation.

Key words

Perovskite/Palladium/Phase boundary/DeNOx catalysis/Reaction kinetics/ALUMINA-SUPPORTED PALLADIUM/PLUS CO/AMMONIA FORMATION/CERIA/CU/SR/MN/FE/ADSORPTION/PLATINUM

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量7

参考文献量56

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