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 language | English |
|---|---|
| Pages (from-to) | 22721-22728 |
| Number of pages | 8 |
| Journal | RSC Advances |
| Volume | 9 |
| Issue number | 39 |
| DOIs | |
| Publication status | Published - 2019 Jan 1 |
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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 journal › Article
}
TY - JOUR
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.
UR - http://www.scopus.com/inward/record.url?scp=85069794456&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85069794456&partnerID=8YFLogxK
U2 - 10.1039/c9ra03050f
DO - 10.1039/c9ra03050f
M3 - Article
VL - 9
SP - 22721
EP - 22728
JO - RSC Advances
JF - RSC Advances
SN - 2046-2069
IS - 39
ER -