TY - JOUR
T1 - Co/Al2O3 lean NOx reduction catalyst
AU - Yan, Ji Yang
AU - Kung, Mayfair C.
AU - Sachtler, Wolfgang M.H.
AU - Kung, Harold H.
N1 - Funding Information:
The authors thank A. Chu-Kung and J.-H. Lee for the collection of UV-Vis spectra and Dr. B. J. Adelman for providing Co/ZSM-5. Support of this work by the U.S. Department of Energy, Basic Energy Science, General Motor Corporation, and Ford Motor Company is gratefully acknowledged.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
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U2 - 10.1006/jcat.1997.1869
DO - 10.1006/jcat.1997.1869
M3 - Article
AN - SCOPUS:0000796127
VL - 172
SP - 178
EP - 186
JO - Journal of Catalysis
JF - Journal of Catalysis
SN - 0021-9517
IS - 1
M1 - CA971869
ER -