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Passive NOx Reduction with CO Using Pd/TiO2/Al2O3 + WGSR Catalysts Under Simulated Post-Euro IV Diesel Exhaust Conditions

Authors
Hong, Yoon-KiLee, Dae-WonKo, Young-ChulYinghua, LiHan, Hyun-SikLee, Kwan-Young
Issue Date
5월-2010
Publisher
SPRINGER
Keywords
DeNO(x); Selective catalytic reduction (SCR); Pd/TiO2/Al2O3; Cu/ZnO/Al2O3; Post-Euro IV
Citation
CATALYSIS LETTERS, v.136, no.1-2, pp.106 - 115
Indexed
SCIE
SCOPUS
Journal Title
CATALYSIS LETTERS
Volume
136
Number
1-2
Start Page
106
End Page
115
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/116493
DOI
10.1007/s10562-010-0312-5
ISSN
1011-372X
Abstract
This study deals with diesel DeNO(x) catalysis by physically mixed Pd/TiO2/Al2O3 and water-gas-shift reaction (WGSR) catalysts under CO-rich conditions at a CO/NOx ratio of 16. In the post-Euro IV era, many diesel engines are expected to produce CO-rich exhaust emissions due to the trend toward emission regulation and limitations in related technologies. Under these circumstances, the passive DeNOx strategy utilizing CO as a single reductant can be considered appropriate. The Pd/TiO2/Al2O3 catalyst is well known for its high DeNO(x) performance when CO and H-2 are available as NOx reductants. However, when CO is used as a single reductant, the catalyst shows poor DeNOx activity, even if the CO concentration is exceptionally high (CO/NOx = 16). In this study, the DeNO(x) activity of Pd/TiO2/Al2O3 was noticeably improved by physically mixing it with a proper WGSR catalyst (Cu/ZnO/Al2O3), which is capable of producing H-2 and feeding it to Pd/TiO2/Al2O3 successfully even in the presence of O-2. The NOx conversion exceeded 70% at 400-450 degrees C using a Pd/TiO2/Al2O3 + Cu/ZnO/Al2O3 catalyst mixture at a weight ratio of 33:67. The reaction gas consisted of 500 ppm NO, 8000 ppm CO, 8 vol.% O-2, 5 vol.% CO2 and 10 vol.% H2O and w/f was 0.1 g s/cm(3).
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