| 학회 |
한국화학공학회 |
| 학술대회 |
2004년 봄 (04/23 ~ 04/24, 공주대학교) |
| 권호 |
10권 1호, p.988 |
| 발표분야 |
촉매/반응공학 |
| 제목 |
Quantification and Redox Property of the Oxygen-Bridged Cu2+ Dimers as the Active Sites for the NO Decomposition over Cu-ZSM-5 Catalysts |
| 초록 |
For a range of Cu-ZSM-5 catalysts with different Cu-exchange levels on the two kinds of ZSM-5 with different Si/Al ratios, temperature programmed reduction using CO (CO-TPR) followed by H2 (H2-TPR), and temperature programmed desorption of oxygen (O2-TPD) were conducted using an online mass spectrometer to characterize and quantify the copper species on the catalysts in the calcined state. Copper species on the ZSM-5 were quantitatively characterized to exist as Cu2+, (Cu2+-O2--Cu2+)2+ and CuO after calcination in oxygen environment. The N2 formation activities of the catalysts in the decomposition of NO were well correlated with the quantified catalytic amounts of the Cu2+ ions involved in the Cu-dimers, (Cu-O-Cu)2+. The mol fraction of the Cu ions present as the Cu-dimers increased at the sacrifice of the isolated Cu2+ with increasing Cu ion exchange level. Oxygen that could be thermally desorbed from the oxidized catalysts in the O2-TPD was responsible for the reduction of the Cu-dimers. It was concluded that the decomposition of NO over Cu-ZSM-5 catalyst proceeded by the redox of Cu-dimer species, (Cu-O-Cu)2+, as active centers. |
| 저자 |
이득기1, B. Moden2, E. Iglesia2
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| 소속 |
1광주대, 2UC Berkeley |
| 키워드 |
NO decomposition; Cu-ZSM-5; Active site; Characterization
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| E-Mail |
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| VOD |
VOD 보기 |
| 원문파일 |
초록 보기 |
