Effects of Cu-ZuO-Al2O3 addition on passive DeNOx activities of Pd/TiO2/Al2O3 under simulated post EURO-4 exhaust condition

Youngchul Ko, Yoon Ki Hong, Yinghua Li, Dae Won Lee, Youngsan Yoo, Hyunsik Han, Kwan Young Lee Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In our test, the CO/NOx ratio obtained in Euro IV diesel engine exhaust gas during the ESC/ELR+ETC mode test was no less than 16 but, UHC/NOx ratio was as low as 5.5. From this, CO would be preferred as a SCR reductant than UHCs for passive-DeNOx system which was operated without equipment providing additional reductant to the system. Two kinds of combined catalyst system were designed. The one is the system using double layer of separated catalyst (WGSR → DeNOx) and the other is single layer of mixed catalyst (WGSR + DeNOx). In the system using Pd/TiO2/Al2O3 catalyst alone, conversion of NOx into N2 did not occur. This result was expected that NOx adsorbed on the catalyst instead of conversion to N2. As the concentration of hydrogen increased, NOx→N2 conversion and total NOx conversion were increased. This implied that H2 plays an important role in reducing NOx with CO. In the DeNOx and WGSR mixed system at 200°C, homogeneously mixed system showed higher DeNOx activity (37%) and NOx into N2 conversion (25%) than serially packed system. In serially packed catalyst system, H2 generated by WGSR catalyst reacted with O2 before acting as reductant for DeNOx system. On the other hand, H2 acted as a reductant more effectively in homogeneously mixed catalyst system.

Original languageEnglish
Title of host publicationAmerican Chemical Society - 237th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers
Publication statusPublished - 2009 Dec 1
Event237th National Meeting and Exposition of the American Chemical Society, ACS 2009 - Salt Lake City, UT, United States
Duration: 2009 Mar 222009 Mar 26

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other237th National Meeting and Exposition of the American Chemical Society, ACS 2009
CountryUnited States
CitySalt Lake City, UT
Period09/3/2209/3/26

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Ko, Y., Hong, Y. K., Li, Y., Lee, D. W., Yoo, Y., Han, H., & Lee, K. Y. L. (2009). Effects of Cu-ZuO-Al2O3 addition on passive DeNOx activities of Pd/TiO2/Al2O3 under simulated post EURO-4 exhaust condition. In American Chemical Society - 237th National Meeting and Exposition, ACS 2009, Abstracts of Scientific Papers (ACS National Meeting Book of Abstracts).