The influence of the preparation procedure on the storage ande regeneration behavior of Pt and Ba based NOx storage and reduction catalysts
Artikel i vetenskaplig tidskrift, 2009

The influence of the preparation procedure on the performance of NOx storage and reduction catalysts was investigated by means of flow reactor experiments. Three catalysts were examined; one Pt/Al and two Pt/Ba/Al samples. One of the Pt/Ba/Al samples was prepared with Pt impregnated on Al/Ba and one with Ba impregnated on Al/Pt. The results clearly show that the preparation procedure influences the behavior of NOx storage and reduction catalysts both during lean and rich conditions. The order of the impregnation steps is crucial especially at higher temperatures; a higher storage capacity is obtained when impregnating Al/Pt with Ba than when impregnating Al/Ba with Pt. The storage increased with as much as 54% when adding Ba in the last step. The N2O and NH3 formation is also affected by the preparation procedure; there is a clear dependency on the order of impregnation steps. Moreover, N2O is not only formed during rich conditions but also in the beginning of the lean period over the Pt/Al and Al/Pt/Ba samples.

platinum

NOx storage

Pt/Ba/Al

Preparation

N2O formation

barium

NH3 formation

NOx regeneration

alumina

Författare

Anna Maria Lindholm

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Neal Currier

JAZAER DAWODY

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Arif Hidayat

Aleksey Yezerets

Louise Olsson

Chalmers, Kemi- och bioteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Junhui Li

Applied Catalysis B: Environmental

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

Vol. 88 240-248

Styrkeområden

Transport

Materialvetenskap

Ämneskategorier

Kemiteknik