Passive NOx reduction with CO using Pd/TiO2/Al 2O3 + WGSR catalysts under simulated post-euro IV diesel exhaust conditions

Yoon Ki Hong, Dae Won Lee, Young Chul Ko, Li Yinghua, Hyun Sik Han, Kwan Young Lee

Research output: Contribution to journalArticle

10 Citations (Scopus)

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 languageEnglish
Pages (from-to)106-115
Number of pages10
JournalCatalysis Letters
Volume136
Issue number1-2
DOIs
Publication statusPublished - 2010 May 1

Fingerprint

Vehicle Emissions
Water gas shift
Carbon Monoxide
Catalysts
Reducing Agents
Catalysis
Diesel engines
Gases

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 journalArticle

Hong, Yoon Ki ; Lee, Dae Won ; Ko, Young Chul ; Yinghua, Li ; Han, Hyun Sik ; Lee, Kwan Young. / Passive NOx reduction with CO using Pd/TiO2/Al 2O3 + WGSR catalysts under simulated post-euro IV diesel exhaust conditions. In: Catalysis Letters. 2010 ; Vol. 136, No. 1-2. pp. 106-115.
@article{8263d1982afd4920970f25c57780c30e,
title = "Passive NOx reduction with CO using Pd/TiO2/Al 2O3 + WGSR catalysts under simulated post-euro IV diesel exhaust conditions",
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.",
keywords = "Cu/ZnO/AlO, DeNO, Pd/TiO /AlO, Post-Euro IV, Selective catalytic reduction (SCR)",
author = "Hong, {Yoon Ki} and Lee, {Dae Won} and Ko, {Young Chul} and Li Yinghua and Han, {Hyun Sik} and Lee, {Kwan Young}",
year = "2010",
month = "5",
day = "1",
doi = "10.1007/s10562-010-0312-5",
language = "English",
volume = "136",
pages = "106--115",
journal = "Catalysis Letters",
issn = "1011-372X",
publisher = "Springer Netherlands",
number = "1-2",

}

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 -