TY - JOUR
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 - http://www.scopus.com/inward/record.url?scp=0035840076&partnerID=8YFLogxK
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 -