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

doi:10.1039/c9ra03050f

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 journal › Article › peer-review

2 Citations (Scopus)

Abstract

A Pd catalyst supported on Ba-substituted LaAlO₃ perovskite (Pd/La_0.9Ba_0.1AlO_3-δ) was investigated for NO reduction at low temperature by propylene, which revealed that Pd/La_0.9Ba_0.1AlO_3-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/La_0.9Ba_0.1AlO_3-δ shows higher activity for the formation of oxygenated species (C_xH_yO_z) as an intermediate for NO reduction because the surface lattice oxygen has improved mobility via Ba²⁺ substitution in LaAlO₃. Therefore, Pd/La_0.9Ba_0.1AlO_3-δ have high activity for NO reduction, even at low temperatures in a humid condition.

Original language	English
Pages (from-to)	22721-22728
Number of pages	8
Journal	RSC Advances
Volume	9
Issue number	39
DOIs	https://doi.org/10.1039/c9ra03050f
Publication status	Published - 2019 Jan 1

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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@article{56106d7b66e946a4b011023e4550a152,

title = "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.",

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

year = "2019",

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doi = "10.1039/c9ra03050f",

language = "English",

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T1 - Perovskite lattice oxygen contributes to low-temperature catalysis for exhaust gas cleaning

AU - Higo, Takuma

AU - Ueno, Kohei

AU - Omori, Yuki

AU - Tsuchiya, Hiroto

AU - Ogo, Shuhei

AU - Hirose, Satoshi

AU - Mikami, Hitoshi

AU - Sekine, Yasushi

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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.

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