Issue 78, 2016, Issue in Progress

LaCoO3 perovskite in Pt/LaCoO3/K/Al2O3 for the improvement of NOx storage and reduction performances

Abstract

A series of x wt% Pt/LaCoO3/K/Al2O3 (x = 0, 0.3 and 1.0) and 1.0 wt% Pt/K/Al2O3 catalysts were synthesized. The effects of the addition of LaCoO3 perovskite in x wt% Pt/LaCoO3/K/Al2O3 on NOx storage and reduction (NSR) performances were studied. 1.0 wt% Pt/LaCoO3/K/Al2O3 exhibits higher NOx storage capacity and reduction efficiency in NSR than 1.0 wt% Pt/K/Al2O3. Interestingly, when the Pt content is lowered from 1.0 to 0.3 wt%, 0.3 wt% Pt/LaCoO3/K/Al2O3 still shows a higher NOx storage capacity than 1.0 wt% Pt/K/Al2O3 and comparable reduction properties. Moreover, 0.3 wt% Pt/LaCoO3/K/Al2O3 possesses higher resistance to SO2 poisoning and better regenerability than 1.0 wt% Pt/K/Al2O3. In situ DRIFTS analysis shows that NOx storage in 0.3 wt% Pt/LaCoO3/K/Al2O3 is mainly via the nitrate route with small amount of nitrites to nitrates conversion below 200 °C, while NOx storage at higher temperature mainly proceeds via the nitrate route.

Graphical abstract: LaCoO3 perovskite in Pt/LaCoO3/K/Al2O3 for the improvement of NOx storage and reduction performances

Supplementary files

Article information

Article type
Paper
Submitted
18 Jul 2016
Accepted
29 Jul 2016
First published
29 Jul 2016

RSC Adv., 2016,6, 74046-74052

LaCoO3 perovskite in Pt/LaCoO3/K/Al2O3 for the improvement of NOx storage and reduction performances

W. Wen, X. Wang, S. Jin and R. Wang, RSC Adv., 2016, 6, 74046 DOI: 10.1039/C6RA18273A

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