NOx storage and reduction catalysts for automotive lean-burn engines: effect of parameters and storage materials on NOx conversion

Authors
Han, PH Lee, YK Han, SM Rhee, HK
Citation
Ph. Han et al., NOx storage and reduction catalysts for automotive lean-burn engines: effect of parameters and storage materials on NOx conversion, TOP CATAL, 16(1-4), 2001, pp. 165-170
Citations number
14
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
TOPICS IN CATALYSIS
ISSN journal
10225528 → ACNP
Volume
16
Issue
1-4
Year of publication
2001
Pages
165 - 170
Database
ISI
SICI code
1022-5528(2001)16:1-4<165:NSARCF>2.0.ZU;2-N
Abstract
The effect of various parameters on the NOx conversion over NOx storage and reduction catalysts supported on alumina was investigated. The Pt/BaO/Al2O 3 catalyst exhibited a higher NOx reduction activity than the Pt/Al2O3 cata lyst under the static and cycling conditions. The activity of Pt/BaO/Al2O3 catalyst was improved in the cycled feedstream. The Pt/SrO/Al2O3 was found to have as high activity as Pt/BaO/Al2O3 for NOx reduction. In order to ach ieve effective reduction of NOx, NOx storage in the form of Me(NO3)(2) (Me = Ba or Sr) is more favorable than other nitrates and the rich condition sh ould be chosen in such a way that the sorption capacity can be fully regene rated at a fast rate and the inhibition effect by strongly adsorbed molecul es derived from C3H6 and CO can be minimized.