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Highly Active La1− x K x CoO3 Perovskite-type Complex Oxide Catalysts for the Simultaneous Removal of Diesel Soot and Nitrogen Oxides Under Loose Contact Conditions.
- Source :
-
Catalysis Letters . Aug2008, Vol. 124 Issue 1/2, p91-99. 9p. 1 Black and White Photograph, 5 Charts, 6 Graphs. - Publication Year :
- 2008
-
Abstract
- The nanometric La1− x K x CoO3 ( x = 0–0.30) perovskite-type oxides were prepared by a citric acid-ligated method. The catalysts were characterized by means of XRD, IR, BET, XPS and SEM. The catalytic activity for the simultaneous removal of soot and nitrogen oxides was evaluated by a technique of the temperature-programmed oxidation reaction. In the LaCoO3 catalyst, the partial substitution of La3+ at A-site by alkali metal K+ enhanced the catalytic activity for the oxidation of soot particle and reduction of NO x . The La0.70K0.30CoO3 oxides are good candidate catalysts for the simultaneous removal of soot particle and NO x . The combustion temperatures for soot particles over the La0.70K0.30CoO3 catalyst are in the range from 289 to 461 °C, the selectivity of CO2 is 98.4% and the conversion of NO to N2 is 34.6% under loose contact conditions. The possible reasons that can lead to the activity enhancement for the K-substitution samples compared to the unsubstituted sample (LaCoO3) were given. The particle size has a large effect on its catalytic performance for the simultaneous removal of diesel soot and nitrogen oxides. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LANTHANUM compounds
*CATALYSTS
*PEROVSKITE
*NITROGEN oxides
*SOOT
*OXIDATION
Subjects
Details
- Language :
- English
- ISSN :
- 1011372X
- Volume :
- 124
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 33005388
- Full Text :
- https://doi.org/10.1007/s10562-008-9429-1