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Improved low-temperature SCR activity for Fe-BEA catalysts by H2-pretreatment

Radka Nedyalkova (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Soran Shwan (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Louise Olsson (Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK))
Applied Catalysis B: Environmental (0926-3373). Vol. 138 (2013), p. 373-380.
[Artikel, refereegranskad vetenskaplig]

A series of iron-exchanged zeolite beta catalysts (0.5 - 4 wt.-% Fe) have been prepared by incipient wetness impregnation and tested for selective catalytic reduction (SCR) of NOx with ammonia as reductant. The catalysts were characterized using BET, NH3-TPD and XPS before and after H2-pretreatment at 650°C for 5 h. The NH3-SCR activity tests show that the samples pretreated by hydrogen exhibit higher low-temperature SCR activity compared to the fresh samples, while the high-temperature activity remains almost constant. The results clearly show that the high-temperature H2-treatment has a significant influence on the extent of different iron species formed in the zeolite. Furthermore, H2-treatment of hydrothermally aged samples can recover some of the initial activity, although not completely due irreversible dealumination during the ageing. By H2-pretreatment SCR catalysts with high iron loading and high activity can be prepared.

Nyckelord: H-2-treatment, Catalyst regeneration, Low-temperature activity, Lean NOx reduction, NH3-SCR, Fe-BEA, Zeolite catalyst



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Denna post skapades 2013-03-05. Senast ändrad 2015-01-08.
CPL Pubid: 174410

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Kemisk reaktionsteknik (2005-2014)
Kompetenscentrum katalys (KCK)
Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)

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Transport
Hållbar utveckling
Katalys

Chalmers infrastruktur