| IMPROVEMENT OF NOX AND CO REDUCTION PERFORMANCE AT
LOW TEMPERATURE OF H2-SCR CATALYST |
| Choong-kil Seo |
| Department of Automotive & Mechanical Engineering, Howon University |
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| ABSTRACT |
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The purpose of this study is to improve the simultaneous reduction of NOX and CO, harmful gases emitted from
internal combustion engines, at low temperatures using a Pt/TiO2 H2-SCR catalyst. A better NOX/CO reduction performance
was observed upon loading 2 wt% of the additive catalyst CeO2 on the main catalyst Pt because the oxygen storage capacity
improved. In the presence of CO, the water gas reaction was promoted, resulting in the NOX conversion rate by the 0.5Pt-
2CeO2/TiO2 SCR catalyst of 42 % at 75 °C and 70 % at 100 °C; this was a 15 ~ 20 % higher NOX conversion as compared to
without CO at low temperatures. The NOX reduction performance by the 0.5Pt-2CeO2-2ZrO2/TiO2 SCR catalyst was the
highest at temperatures below 100 °C. At an appropriate amount of the additive catalyst ZrO2, the reaction rate improved
because the acid point of the catalyst surface and the intensity of adsorption are adjusted. The optimum reduction temperature
for NOX/CO reduction performance by the H2-SCR catalyst was 400 °C. Our results also indicate that the Pt species has a
significant impact. |
| Key Words:
Catalyst, Nitrogen oxide, Selective catalytic reduction, Carbon monoxide, TiO2 |
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Corresponding Author.
Choong-kil Seo , Email. 
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