Abstract
This study deals with diesel DeNOx 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 DeNOx performance when CO and H2 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 DeNOx activity of Pd/TiO2/Al2O3 was noticeably improved by physically mixing it with a proper WGSR catalyst (Cu/ZnO/Al 2O3), which is capable of producing H2 and feeding it to Pd/TiO2/Al2O3 successfully even in the presence of O2. The NOx conversion exceeded 70% at 400-450 °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.% O2, 5 vol.% CO2 and 10 vol.% H2O and w/f was 0.1 g s/cm 3.
| Original language | English |
|---|---|
| Pages (from-to) | 106-115 |
| Number of pages | 10 |
| Journal | Catalysis Letters |
| Volume | 136 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - 2010 May 1 |
Fingerprint
Keywords
- Cu/ZnO/AlO
- DeNO
- Pd/TiO /AlO
- Post-Euro IV
- Selective catalytic reduction (SCR)
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)
Cite this
Passive NOx reduction with CO using Pd/TiO2/Al 2O3 + WGSR catalysts under simulated post-euro IV diesel exhaust conditions. / Hong, Yoon Ki; Lee, Dae Won; Ko, Young Chul; Yinghua, Li; Han, Hyun Sik; Lee, Kwan Young.
In: Catalysis Letters, Vol. 136, No. 1-2, 01.05.2010, p. 106-115.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Passive NOx reduction with CO using Pd/TiO2/Al 2O3 + WGSR catalysts under simulated post-euro IV diesel exhaust conditions
AU - Hong, Yoon Ki
AU - Lee, Dae Won
AU - Ko, Young Chul
AU - Yinghua, Li
AU - Han, Hyun Sik
AU - Lee, Kwan Young
PY - 2010/5/1
Y1 - 2010/5/1
N2 - This study deals with diesel DeNOx 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 DeNOx performance when CO and H2 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 DeNOx activity of Pd/TiO2/Al2O3 was noticeably improved by physically mixing it with a proper WGSR catalyst (Cu/ZnO/Al 2O3), which is capable of producing H2 and feeding it to Pd/TiO2/Al2O3 successfully even in the presence of O2. The NOx conversion exceeded 70% at 400-450 °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.% O2, 5 vol.% CO2 and 10 vol.% H2O and w/f was 0.1 g s/cm 3.
AB - This study deals with diesel DeNOx 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 DeNOx performance when CO and H2 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 DeNOx activity of Pd/TiO2/Al2O3 was noticeably improved by physically mixing it with a proper WGSR catalyst (Cu/ZnO/Al 2O3), which is capable of producing H2 and feeding it to Pd/TiO2/Al2O3 successfully even in the presence of O2. The NOx conversion exceeded 70% at 400-450 °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.% O2, 5 vol.% CO2 and 10 vol.% H2O and w/f was 0.1 g s/cm 3.
KW - Cu/ZnO/AlO
KW - DeNO
KW - Pd/TiO /AlO
KW - Post-Euro IV
KW - Selective catalytic reduction (SCR)
UR - http://www.scopus.com/inward/record.url?scp=77951622729&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77951622729&partnerID=8YFLogxK
U2 - 10.1007/s10562-010-0312-5
DO - 10.1007/s10562-010-0312-5
M3 - Article
AN - SCOPUS:77951622729
VL - 136
SP - 106
EP - 115
JO - Catalysis Letters
JF - Catalysis Letters
SN - 1011-372X
IS - 1-2
ER -