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, Chak Tong AU*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)65-80
Number of pages16
JournalApplied Catalysis B: Environmental
Volume33
Issue number1
DOIs
Publication statusPublished - 10 Sep 2001

Scopus Subject Areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

User-Defined Keywords

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

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