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

Takuma Higo, Kohei Ueno, Yuki Omori, Hiroto Tsuchiya, Shuhei Ogo, Satoshi Hirose, Hitoshi Mikami, Yasushi Sekine

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)22721-22728
Number of pages8
JournalRSC Advances
Volume9
Issue number39
DOIs
Publication statusPublished - 2019 Jan 1

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Exhaust gases
Perovskite
Catalysis
Cleaning
Oxygen
Propylene
Temperature
Catalysts
Surface reactions
Catalyst supports
Transient analysis
Fourier transform infrared spectroscopy
Substitution reactions
Thermodynamic properties
X ray photoelectron spectroscopy
perovskite
propylene

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning. / Higo, Takuma; Ueno, Kohei; Omori, Yuki; Tsuchiya, Hiroto; Ogo, Shuhei; Hirose, Satoshi; Mikami, Hitoshi; Sekine, Yasushi.

In: RSC Advances, Vol. 9, No. 39, 01.01.2019, p. 22721-22728.

Research output: Contribution to journalArticle

Higo, Takuma ; Ueno, Kohei ; Omori, Yuki ; Tsuchiya, Hiroto ; Ogo, Shuhei ; Hirose, Satoshi ; Mikami, Hitoshi ; Sekine, Yasushi. / Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning. In: RSC Advances. 2019 ; Vol. 9, No. 39. pp. 22721-22728.
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AU - Hirose, Satoshi

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