An investigation on the utilization of perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) as three-way catalysts

H. He; H. X. Dai; C. T. Au

doi:10.1016/S0926-3373(01)00159-X

An investigation on the utilization of perovskite-type oxides La_1-xSr_xMO₃ (M = Co_0.77Bi_0.20Pd_0.03) as three-way catalysts

H. He
, H. X. Dai
, C. T. Au^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

70 Citations (Scopus)

Abstract

The perovskite-type oxides La_1-xSr_xMO₃ (M = Co_0.77Bi_0.20Pd_0.03) have been investigated for three-way catalytic performance and characterized by means of temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalysts exhibited good activity in CO elimination: La_0.8Sr_0.2MO₃ showed ca. 100% CO conversion at 160°C, 60 000 h^-1, and λ = 1.00. Under similar reaction conditions, the activity for C₃H₆ elimination decreased in the order of La_0.2Sr_0.8MO₃ > La_0.8Sr_0.2MO₃ > La_0.4Sr_0.6MO₃ > La_0.6Sr_0.4MO₃ > LaMO₃, while the activity for NO elimination decreased in the order of La_0.8Sr_0.2MO₃ > La_0.2Sr_0.8MO₃ > La_0.4Sr_0.6MO₃ > La_0.6Sr_0.4MO₃ > LaMO₃. With x < 0.6, La_1-xSr_xMO₃ were single-phase and hexagonal in structure; at x = 0.6 and 0.8, they were cubic and there was a trace amount of the La₂O₃ phase. The results of TPD, TPR, and XPS studies revealed the coexistence of over-stoichiometric oxygen vacancies in La_0.8Sr_0.2MO₃, a criterion for good three-way catalytic performance.

Original language	English
Pages (from-to)	65-80
Number of pages	16
Journal	Applied Catalysis B: Environmental
Volume	33
Issue number	1
DOIs	https://doi.org/10.1016/S0926-3373(01)00159-X
Publication status	Published - 10 Sept 2001

User-Defined Keywords

Automotive exhaust purification
LaSrMO (M = CoBiPd)
Oxidative nonstoichiometry
Perovskite-type oxides
Three-way catalysts

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10.1016/S0926-3373(01)00159-X

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title = "An investigation on the utilization of perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) as three-way catalysts",

abstract = "The perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) have been investigated for three-way catalytic performance and characterized by means of temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalysts exhibited good activity in CO elimination: La0.8Sr0.2MO3 showed ca. 100\% CO conversion at 160°C, 60 000 h-1, and λ = 1.00. Under similar reaction conditions, the activity for C3H6 elimination decreased in the order of La0.2Sr0.8MO3 > La0.8Sr0.2MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3, while the activity for NO elimination decreased in the order of La0.8Sr0.2MO3 > La0.2Sr0.8MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3. With x < 0.6, La1-xSrxMO3 were single-phase and hexagonal in structure; at x = 0.6 and 0.8, they were cubic and there was a trace amount of the La2O3 phase. The results of TPD, TPR, and XPS studies revealed the coexistence of over-stoichiometric oxygen vacancies in La0.8Sr0.2MO3, a criterion for good three-way catalytic performance.",

keywords = "Automotive exhaust purification, LaSrMO (M = CoBiPd), Oxidative nonstoichiometry, Perovskite-type oxides, Three-way catalysts",

author = "H. He and Dai, \{H. X.\} and Au, \{C. T.\}",

note = "Funding Information: The work described in this paper was fully supported by a Grant from the Hong Kong Baptist University (FRG/00-01/I-15). We would like to thank K.W. Wong and P.K. Tse of ASMAC, the Chinese University of Hong Kong for performing XPS experiments. Publisher copyright: {\textcopyright} 2001 Elsevier Science B.V.",

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doi = "10.1016/S0926-3373(01)00159-X",

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T1 - An investigation on the utilization of perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) as three-way catalysts

AU - He, H.

AU - Dai, H. X.

AU - Au, C. T.

N1 - Funding Information: The work described in this paper was fully supported by a Grant from the Hong Kong Baptist University (FRG/00-01/I-15). We would like to thank K.W. Wong and P.K. Tse of ASMAC, the Chinese University of Hong Kong for performing XPS experiments. Publisher copyright: © 2001 Elsevier Science B.V.

PY - 2001/9/10

Y1 - 2001/9/10

N2 - The perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) have been investigated for three-way catalytic performance and characterized by means of temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalysts exhibited good activity in CO elimination: La0.8Sr0.2MO3 showed ca. 100% CO conversion at 160°C, 60 000 h-1, and λ = 1.00. Under similar reaction conditions, the activity for C3H6 elimination decreased in the order of La0.2Sr0.8MO3 > La0.8Sr0.2MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3, while the activity for NO elimination decreased in the order of La0.8Sr0.2MO3 > La0.2Sr0.8MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3. With x < 0.6, La1-xSrxMO3 were single-phase and hexagonal in structure; at x = 0.6 and 0.8, they were cubic and there was a trace amount of the La2O3 phase. The results of TPD, TPR, and XPS studies revealed the coexistence of over-stoichiometric oxygen vacancies in La0.8Sr0.2MO3, a criterion for good three-way catalytic performance.

AB - The perovskite-type oxides La1-xSrxMO3 (M = Co0.77Bi0.20Pd0.03) have been investigated for three-way catalytic performance and characterized by means of temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The catalysts exhibited good activity in CO elimination: La0.8Sr0.2MO3 showed ca. 100% CO conversion at 160°C, 60 000 h-1, and λ = 1.00. Under similar reaction conditions, the activity for C3H6 elimination decreased in the order of La0.2Sr0.8MO3 > La0.8Sr0.2MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3, while the activity for NO elimination decreased in the order of La0.8Sr0.2MO3 > La0.2Sr0.8MO3 > La0.4Sr0.6MO3 > La0.6Sr0.4MO3 > LaMO3. With x < 0.6, La1-xSrxMO3 were single-phase and hexagonal in structure; at x = 0.6 and 0.8, they were cubic and there was a trace amount of the La2O3 phase. The results of TPD, TPR, and XPS studies revealed the coexistence of over-stoichiometric oxygen vacancies in La0.8Sr0.2MO3, a criterion for good three-way catalytic performance.

KW - Automotive exhaust purification

KW - LaSrMO (M = CoBiPd)

KW - Oxidative nonstoichiometry

KW - Perovskite-type oxides

KW - Three-way catalysts

UR - https://www.scopus.com/pages/publications/0035840076

U2 - 10.1016/S0926-3373(01)00159-X

DO - 10.1016/S0926-3373(01)00159-X

M3 - Journal article

AN - SCOPUS:0035840076

SN - 0926-3373

VL - 33

SP - 65

EP - 80

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

IS - 1

ER -

An investigation on the utilization of perovskite-type oxides La_1-xSr_xMO₃ (M = Co_0.77Bi_0.20Pd_0.03) as three-way catalysts

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