Journal
CHEMICAL ENGINEERING SCIENCE
Volume 87, Issue -, Pages 75-90Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2012.10.001
Keywords
Catalysis; Environment; Pollution; Catalyst support; Diesel exhaust gas cleaning; Alumina washcoats
Categories
Funding
- Government of Aragon
- La Caixa [GA-LC-030/2008]
- CSIC
Ask authors/readers for more resources
Structured catalysts for the simultaneous removal of soot and nitrogen oxides were prepared by means of coating cordierite monoliths with alumina-based suspensions containing Cu, Co or V and K as the catalytically active phase. Alumina suspensions were prepared using a high dispersible boehmite. Viscosity and pH of this suspension strongly depended on their composition. Highly viscous suspensions led to the formation of cracks and defects that resulted in the detachment of the catalytic layer from the walls. Textural and chemical properties of the coated monoliths were determined by means of N-2-physisorption, X-ray diffraction and temperature programmed reduction. Activity of the prepared catalytic filters in the simultaneous removal of soot and nitrogen oxides was tested in a fixed bed installation in the presence of 500 ppm NO and 5% O-2 and at temperatures from 250 to 650 degrees C. Almost complete oxidation of the carbon black employed as soot surrogate was measured in most cases, with NO reduction reaching 50% in the presence of the most active Co-K catalysts. Co-containing catalysts showed higher activity than Cu and V-ones. Enhanced activity can be ascribed to higher ability to generate NO2, but also to particular layer thickness and morphology which facilitate alkali mobility, key issue in the simultaneous removal mechanism. (c) 2012 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available