Characteristics of Exhaust Emissions Conversion of Commercial Cu- and Fe-SCR Catalyts
| Autor: | Choong-Kil Seo, Kyung seok Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
biology 020209 energy Inorganic chemistry chemistry.chemical_element Exhaust gas Active site 02 engineering and technology Diesel engine Catalysis Metal 020303 mechanical engineering & transports 0203 mechanical engineering chemistry visual_art Automotive Engineering 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium biology.protein Carbon NOx Space velocity |
| Zdroj: | International Journal of Automotive Technology. 21:1401-1408 |
| ISSN: | 1976-3832 1229-9138 |
| Popis: | The purpose of this study is to identify the performance of the SCR catalyst according to the thermal aging, coking and space velocity subjected for commercial catalysts (Cu- and Fe-SCR). The Cu-SCR (Fresh) catalyst showed 83 % of high NOx reduction rate in the low temperature of 200 °C, and the performance window of NOx reduction rate was established widely in all temperature ranges. Fe-SCR (800 °C 22hr) catalyst was slightly improved with the NOx reduction rate compared to the Fe-SCR (Fresh) catalyst, and this was due to the increase in the intensity of acid site due to the de-aluminization. Cu-SCR (0.1 g coking) catalyst reduced NOx reduction rate by about 20–40 % compared to the Fresh catalyst due to the clogging of the catalyst active site by the carbon. When carbon of 0.1 g was deposited on the Cu- and Fe-SCR catalysts, it was reduced to NOx conversion rate because metal was deposited on active site of the SCR catalyst. In the effect of the space velocity of Cu-SCR (Fresh) catalysts, SV 44,000 h−1 and 56,000 h−1 reduced NOx conversion rate by about 15–40 % at the overall temperature compared to 28,000 h−1. The larger the SV, the time for the exhaust gas to react with the catalysts is shortened. For SV 40,000 h−1 and 56,000 h−1, NOx conversion rate was equivalent. |
| Databáze: | OpenAIRE |
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