| Autor: |
Skarlis, Stavros A., Berthout, David, Nicolle, André, Dujardin, Christophe, Granger, Pascal |
| Zdroj: |
The Journal of Physical Chemistry - Part C; March 2013, Vol. 117 Issue: 14 p7154-7169, 16p |
| Abstrakt: |
Among different types of Fe-exchanged zeolites, Fe-BEA exhibits very promising surface properties for developing efficient urea or NH3-SCR systems. In this work, dedicated experimental and kinetic modeling studies were performed in order to elucidate mechanistic aspects related to NH3storage and release on these catalysts. A series of NH3adsorption and desorption experiments were performed over both H- and Fe-exchanged BEA zeolites, taking into account a broad range of operating conditions. Coupling FTIR spectroscopy, surface NH3adspecies were characterized. NH3gaseous concentration profiles were subsequently simulated by means of a detailed multisite kinetic model, being able to account for low-temperature adsorption phenomena. Finally, correlations between surface acidity and model sites were enabled by comparing IR spectroscopy and model predicted results, leading to the development of a phenomenological semidetailed, multisite kinetic modeling approach. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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