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On the activity and stability of Pt-K/Al2O3 LNT catalysts for diesel soot and NOx abatement

Paper ID Volume ID Publish Year Pages File Format Full-Text
45418 46410 2014 9 PDF Available
Title
On the activity and stability of Pt-K/Al2O3 LNT catalysts for diesel soot and NOx abatement
Abstract

•The soot decreases the NOx storage activity of Pt-K/Al2O3 catalyst at any temperature in the range 250–350 °C.•The stability of the species stored over Pt-K/Al2O3 catalyst is lower in the presence of soot.•Nitrates ad-species directly interact with soot and participate to the soot combustion.•Aged catalyst shows a lower storage capacity and a lower soot oxidation activity attributed to the volatile nature of K-active species.

DPNR Pt-K/Al2O3 catalyst has been studied for the simultaneous removal of soot and NOx, in the presence of both water and carbon dioxide. In particular, the effect of soot on the NOx storage activity and on the stability of Pt-K/Al2O3 catalyst has been addressed. It has been found that: (i) the presence of soot decreases the NOx storage activity at any temperature in the range 250–350 °C; (ii) the stability of the adsorbed species is lower in the presence of soot; (iii) nitrates ad-species directly interact with soot and participate to the soot combustion; (iv) aged catalyst shows a lower storage capacity and a lower soot oxidation activity attributed to loss of K-active species.

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Keywords
Soot oxidation; DPNR catalysts; Simultaneous NOx and soot removal; Diesel particulate NOx reduction; LNT catalysts
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On the activity and stability of Pt-K/Al2O3 LNT catalysts for diesel soot and NOx abatement
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 783–791
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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