Conversion and in situ FTIR studies of direct NO decomposition over Cu-ZSM5
Yazarlar (3)
| Makale Türü | Özgün Makale (Uluslararası alan indekslerindeki dergilerde yayınlanan tam makale) | ||
| Dergi Adı | Applied Catalysis B: Environmental | ||
| Makale Dili | – | Basım Tarihi | 08-1998 |
| Cilt / Sayı / Sayfa | 17 / 4 / 293–311 | DOI | – |
| Makale Linki | https://www.sciencedirect.com/science/article/pii/S0926337397000921 | ||
| UAK Araştırma Alanları |
Dedektör Teknolojisi
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| Özet |
| Copper ion-exchanged zeolites ZSM5 with SiO2:Al2O3 molar ratios 33 and 53 have been subjected to activity tests for direct decomposition of NO (2000ppm, GHSV 560–5400h−1). In situ infrared measurements were used to follow the reaction and surface and gas phase compositions. IR studies were also done in excess oxygen with rapid NO2 formation in the gas phase. A high level of overexchange of copper in the zeolite in combination with a low concentration of acid sites, concurrent with a high SiO2:Al2O3 ratio, enhances the conversion of NO. A vibrational band at 1631cm−1 is observed below the light-off temperature and interpreted as a bridged nitrato group bound to Cu2+–O–Cu2+ dimers. This band disappears above the light-off temperature but the intensity below this temperature correlates with the catalytic activity. We interpret that these bridge bound nitrato groups act as siteblockers on the active … |
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