Improved low-temperature SCR activity for Fe-BEA catalysts by H2-pretreatment
Artikel i vetenskaplig tidskrift, 2013

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.

NH3-SCR

Lean NOx reduction

Fe-BEA

Low-temperature activity

Zeolite catalyst

H-2-treatment

Catalyst regeneration

Författare

Radka Nedyalkova

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Soran Shwan

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Louise Olsson

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 138 373-380

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Ämneskategorier

Kemiska processer

DOI

10.1016/j.apcatb.2013.03.009

Mer information

Skapat

2017-10-07