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Deactivation of Cu/SAPO-34 during low-temperature NH3-SCR

Kirsten Leistner (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik) ; Louise Olsson (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK))
Applied Catalysis B-Environmental (0926-3373). Vol. 165 (2015), p. 192-199.
[Artikel, refereegranskad vetenskaplig]

The sensitivity of NH3-SCR activity to water vapour at 70 degrees C is tested for Cu/SAPO-34 (morph.) catalysts. The synthesised Cu/SAPO-34 (morph.) is remarkably susceptible to low-temperature activity loss. After only 3 hat 70 degrees C, the NOx conversion decreases from an initial 87% to 66% at 200 degrees C, after another 9 h to 6%. This deactivation is accompanied by a partial loss of microporous volume, but the SAPO-34 framework remains crystalline. We postulate that a transformation of the active copper sites into an inactive form could be the cause for the deactivation. Regeneration of the catalyst was attempted, but had no impact on activity.

Nyckelord: Cu/SAPO-34, Deactivation, Hydrothermal stability, Ammonia SCR, Water



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Denna post skapades 2015-02-17. Senast ändrad 2015-07-28.
CPL Pubid: 212689

 

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