Ammonia formation from nitric oxide over Pd-based catalysts in multicomponent feed gas compositions
Artikel i vetenskaplig tidskrift, 2017

Using multicomponent gas feeds, the formation of ammonia from nitric oxide over Pd/Al2O3 and Pd/Ce/Al2O3 model catalysts was compared to that of a commercially-available three-way catalyst. Steady- state oxygen-sweep experiments show that the highest activity for ammonia formation is obtained over the Pd/Ce/Al2O3 catalyst whilst the lowest activity is observed for the three-way catalyst. The latter is consid- ered to be linked to the incorporation of rhodium, a component that promotes the NOx reduction selectivity towards N2. Also, lean/rich cycling experiments were carried out to simulate the cycling conditions that passive-SCR after treatment systems depend upon. High activity is again seen over the Pd/Ce/Al2O3 cata- lyst during short periodic switches. For the three-way catalyst, longer periodic switches are required for the onset of ammonia formation due to the high oxygen storage capacity of this sample as compared to the other two. Hence, a future direction of investigation could be to develop materials with equivalent water- gas shift properties of ceria, but with reduced oxygen storage capacity so as to provide hydrogen for reaction without incurring a significant delay in ammonia formation.

Författare

Emma Adams

Kompetenscentrum katalys (KCK)

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Per-Anders Carlsson

Kompetenscentrum katalys (KCK)

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Catalysis Communications

1566-7367 (ISSN)

Vol. 95 26-30

Kompetenscentrum katalys KCK

Volvo Group, 2014-01-01 -- 2017-12-31.

Volvo Cars, 2014-01-01 -- 2017-12-31.

Chalmers, 2014-01-01 -- 2017-12-31.

ECAPS AB, 2014-01-01 -- 2017-12-31.

Scania CV AB, 2014-01-01 -- 2017-12-31.

Energimyndigheten, 2014-01-01 -- 2017-12-31.

Wärtsilä Finland, 2014-01-01 -- 2017-12-31.

Haldor Topsoe, 2014-01-01 -- 2017-12-31.

Högeffektiv Ottomotor med utspädd förbränning II

Energimyndigheten, 2015-01-01 -- 2017-12-31.

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiska processer

Materialkemi

DOI

10.1016/j.catcom.2017.03.001

Mer information

Senast uppdaterat

2018-10-28