Issue 39, 2019, Issue in Progress

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

Abstract

A Pd catalyst supported on Ba-substituted LaAlO3 perovskite (Pd/La0.9Ba0.1AlO3−δ) was investigated for NO reduction at low temperature by propylene, which revealed that Pd/La0.9Ba0.1AlO3−δ has remarkably higher activity than other Pd catalysts at low temperatures (≤573 K) for NO reduction by propylene. To elucidate the surface reaction pathway, transient response tests were conducted using 18O2. Also, X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) measurements were conducted. Comparison with a Ba-impregnated catalyst (Pd/Ba/LaAlO3) demonstrated that Pd/La0.9Ba0.1AlO3−δ shows higher activity for the formation of oxygenated species (CxHyOz) as an intermediate for NO reduction because the surface lattice oxygen has improved mobility via Ba2+ substitution in LaAlO3. Therefore, Pd/La0.9Ba0.1AlO3−δ have high activity for NO reduction, even at low temperatures in a humid condition.

Graphical abstract: Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

Supplementary files

Article information

Article type
Paper
Submitted
24 Apr 2019
Accepted
16 Jul 2019
First published
23 Jul 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 22721-22728

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

T. Higo, K. Ueno, Y. Omori, H. Tsuchiya, S. Ogo, S. Hirose, H. Mikami and Y. Sekine, RSC Adv., 2019, 9, 22721 DOI: 10.1039/C9RA03050F

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