Comparative Study of SO 2 and SO 2 /SO 3 Poisoning and Regeneration of Cu/BEA and Cu/SSZ-13 for NH 3 SCR

Auvray, Xavier,1986Chalmers tekniska högskola,Chalmers University of Technology (författare)

Two copper-exchanged zeolites, Cu/SSZ-13 and Cu/BEA, were studied as catalysts for the selective reduction of NOx by 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 SO2 and a mixture of 24 ppm SO3 + 6 ppm SO2 was evaluated. The repetition of subsequent activity measurements served as regeneration method in SCR conditions. SO2 deactivated Cu/SSZ-13 whereas Cu/BEA was only moderately affected. SO3 led 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. NH3 temperature-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 SO2 interacts with the ZCuOH sites on Cu/SSZ-13, causing the strong poisoning.

Arvanitidou, MariaChalmers tekniska högskola,Chalmers University of Technology (författare)
Högström, ÅsaChalmers tekniska högskola,Chalmers University of Technology (författare)
Jansson, Jonas,1973Volvo Group(Swepub:cth)jansson (författare)
Fouladvand, Sheedeh,1984Volvo Group(Swepub:cth)sheedeh (författare)
Olsson, Louise,1974Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)louisej (författare)
Chalmers tekniska högskolaVolvo Group (creator_code:org_t)

Ingår i:Emission Control Science and Technology: Springer Science and Business Media LLC7:4, s. 232-2462199-36292199-3637

Av författaren/redakt...: Auvray, Xavier, ...; Arvanitidou, Mar ...; Högström, Åsa; Jansson, Jonas, ...; Fouladvand, Shee ...; Olsson, Louise, ...

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