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NH3 Generation Characteristics of a LNT Catalyst Downstream
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 Title & Authors
NH3 Generation Characteristics of a LNT Catalyst Downstream
Seo, Choong-Kil;
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As diesel engines have high power and good fuel economy on top of less emissions, their market shares are increasing not only in commercial vehicles but also in passenger cars. LNT, urea-SCR and combination of them have been developed for after-treatment of the exhaust gas to reduce NOx on diesel vehicles. The aim of this study is to investigate the generation characteristics of LNT catalyst downstream. It was found from the experiments of the LNT catalyst that was useful as a reductant in SCR catalyst because it can enhance the de-NOx performance and improve selectivity. The generation of the LNT, when hydrothermally aged at for 18 hr, increased to about 90ppm at due to Pt sintering and Ba agglomeration. LNT catalyst was most sulfur poisoning at . The slip increased due to the reduction of residence time according to SV increase.
Diesel engine;Catalyst;Lean NOx Trap;Selective Catalytic Reduction;;
 Cited by
The De-CH4Characteristics of NGOC for CH4Reduction of a CNG Bus, Journal of the Korea Society For Power System Engineering, 2016, 20, 4, 69  crossref(new windwow)
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C. K. Seo, H. N. Kim and B. C. Choi, 2010, "Characteristics of Adsorption, Desorption of Exhaust Gases and Deactivation of LNT and SCR Catalysts for Diesel Vehicles", Journal of The Korean Society for Power System Engineering, Vol. 14, No. 12, pp. 13-19.

B. C. Choi and K. S. Lee, 2014, "LNT/CDPF Catalysts for Simultaneous Removal of NOx and PM from Diesel Vehicle Exhaust", Chemical Engineering Journal, Vol. 240, No. 5, pp. 476-486. crossref(new window)

W. Wang, J. M Herreros, A. Tsolakis and A. P. E York, 2015, "Increased $NO_2$ Concentration in the Diesel Engine Exhaust for Improved $Ag/Al_2O_3$ Catalyst $NH_3$-SCR Activity", Chemical Engineering Journal, Vol. 270, No. 6, pp. 582-589. crossref(new window)

C. K. Seo, H. N. Kim, B. C. Choi, M. T. Lim, C. H. Lee and C. B. Lee, 2011, "De-NOx Characteristics of a Combined System of LNT and SCR Catalysts according to Hydrothermal Aging and Sulfur Poisoning", Catalysis Today, Vol. 164, No. 8, pp. 507-514. crossref(new window)

J. Wang, Y. Ji, G. Jacobs, S. Jones, D. J. Kim, M. Crocker, 2014, "Effect of Aging on NOx Reduction in Coupled LNT-SCR Systems", Applied Catalysis B, Vol. 148, No. 8, pp. 51-61.

C. K. Seo, 2012, "Optimization of an LNTSCR Combined System to De-NOx the Diesel Engine Exhaust Gas" Dissertation for the Degree of Ph. D., Chonnam National University, pp. 81.