دورية
Comparative Study of SO2and SO2/SO3Poisoning and Regeneration of Cu/BEA and Cu/SSZ-13 for NH3SCR
| العنوان: | Comparative Study of SO2and SO2/SO3Poisoning and Regeneration of Cu/BEA and Cu/SSZ-13 for NH3SCR |
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| المؤلفون: | Auvray, Xavier, Arvanitidou, Maria, Högström, Åsa, Jansson, Jonas, Fouladvand, Sheedeh, Olsson, Louise |
| المصدر: | Emission Control Science and Technology; December 2021, Vol. 7 Issue: 4 p232-246, 15p |
| مستخلص: | Two copper-exchanged zeolites, Cu/SSZ-13 and Cu/BEA, were studied as catalysts for the selective reduction of NOxby NH3(NH3-SCR). Their activities for standard SCR (NOx= NO) and fast SCR (NOx= 50% NO + 50% NO2) were measured before and after sulfur poisoning at 250 °C. The effect of 30 ppm SO2and a mixture of 24 ppm SO3+ 6 ppm SO2was evaluated. The repetition of subsequent activity measurements served as regeneration method in SCR conditions. SO2deactivated Cu/SSZ-13 whereas Cu/BEA was only moderately affected. SO3led to stronger deactivation of both catalysts than SO2. However, also for this case, the Cu/BEA was significantly less affected than Cu/SSZ-13, even though Cu/BEA contained larger amount of stored sulfur. One possible reason for this could be the large pores of Cu/BEA, where the sulfur species possibly resulted in less sterical hindrance than in the small pore SSZ-13 structure. NH3temperature-programmed desorption (NH3-TPD) showed no loss of storage sites upon sulfur treatment and subsequent regeneration. Partial activity recovery was observed after a period in SCR conditions at 400 °C and 500 °C. Temperature at 300 °C was insufficient to regenerate the catalysts. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of NO adsorption suggested that SO2interacts with the ZCuOH sites on Cu/SSZ-13, causing the strong poisoning. |
| قاعدة البيانات: | Supplemental Index |
Find this article in full text from Springer Verlag. 
Full Text Finder | تدمد: | 21993629 21993637 |
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| DOI: | 10.1007/s40825-021-00203-4 |