| 학회 |
한국화학공학회 |
| 학술대회 |
2014년 가을 (10/22 ~ 10/24, 대전 DCC) |
| 권호 |
20권 2호, p.2487 |
| 발표분야 |
신진연구자 심포지엄 |
| 제목 |
Effect of hydrothermal aging on local environment of active site in CuSSZ13 |
| 초록 |
CuSSZ13 has been regarded as the most proven Urea/SCR catalyst for reducing NOx from diesel engine, mainly due to its excellent low-temperature activity and strong thermal stability. However, despite extensive efforts to understand the characteristics of CuSSZ13, the local environment of the Cu2+ ions on the catalyst surface and the reason behind its robust thermal stability have not been fully elucidated yet. In the present study, the catalytic activity and properties of a series of CuSSZ13 catalysts w.r.t. the Cu content and Si/Al ratio have been investigated before and after aging, to understand their hydrothermal stability. The thermal deactivation of CuSSZ13 becomes more severe with increasing Cu content and/or Si/Al ratio. Based upon the ESR studies, the D6R sites are exchanged first by Cu2+ ions upto their accommodation capacity, followed by the occupation of the CHA sites with increasing Cu content and Si/Al ratio. The origin of the severe deactivation of CuSSZ13 upon aging with the high Cu content and Si/Al ratio appeared to be the facile agglomeration of the Cu2+ ion in CHA due to its less stable nature, leading to the formation of CuOx clusters whose growth may destroy the crystal structure of SSZ13. |
| 저자 |
김영진, 이준규, 민경명, 홍석봉, 조병권, 남인식
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| 소속 |
포항공과대 |
| 키워드 |
NH3/SCR; CuSSZ13; Hydrothermal Stability; ESR
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| E-Mail |
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| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
