Co/Al2O3 lean NOx reduction catalyst

JiYang Yan, Mayfair C. Kung, Wolfgang M H Sachtler, Harold H Kung

Research output: Contribution to journalArticle

140 Citations (Scopus)

Abstract

Certain Co/Al2O3 catalysts are active and stable for the selective catalytic reduction (SCR) of NOx by propene or propane. The addition of 30 ppm SO2 to the feed only mildly affects the catalytic performance. The effectiveness of Co/Al2O3 in the SCR process depends strongly on the Co loading, the calcination temperature, and the source of alumina. Characterization of the catalysts with UV-vis spectroscopy under ambient conditions, temperature-programmed reduction by H2 (H2-TPR), XRD, iodometric titration, and BET surface area measurements led to the proposal that there exist four different Co species: Co2+ ions in CoAl2O4, small Co3O4 particles that interact strongly with Al2O3, large Co3O4 particles, and dispersed surface Co2+ ions in octahedral coordination. The latter Co2+ species are likely the catalytically most active species. Their propensity to interact with NOx is reminiscent of that of Co ions in ZSM-5.

Original languageEnglish
Pages (from-to)178-186
Number of pages9
JournalJournal of Catalysis
Volume172
Issue number1
Publication statusPublished - 1997

Fingerprint

Selective catalytic reduction
Ions
catalysts
Catalysts
Propane
ions
Aluminum Oxide
Ultraviolet spectroscopy
Titration
propane
titration
Calcination
roasting
Propylene
proposals
Alumina
aluminum oxides
Temperature
temperature
spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Yan, J., Kung, M. C., Sachtler, W. M. H., & Kung, H. H. (1997). Co/Al2O3 lean NOx reduction catalyst. Journal of Catalysis, 172(1), 178-186.

Co/Al2O3 lean NOx reduction catalyst. / Yan, JiYang; Kung, Mayfair C.; Sachtler, Wolfgang M H; Kung, Harold H.

In: Journal of Catalysis, Vol. 172, No. 1, 1997, p. 178-186.

Research output: Contribution to journalArticle

Yan, J, Kung, MC, Sachtler, WMH & Kung, HH 1997, 'Co/Al2O3 lean NOx reduction catalyst', Journal of Catalysis, vol. 172, no. 1, pp. 178-186.
Yan J, Kung MC, Sachtler WMH, Kung HH. Co/Al2O3 lean NOx reduction catalyst. Journal of Catalysis. 1997;172(1):178-186.
Yan, JiYang ; Kung, Mayfair C. ; Sachtler, Wolfgang M H ; Kung, Harold H. / Co/Al2O3 lean NOx reduction catalyst. In: Journal of Catalysis. 1997 ; Vol. 172, No. 1. pp. 178-186.
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