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.


Emma Adams

Kompetenscentrum katalys

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Kompetenscentrum katalys

Per-Anders Carlsson

Kompetenscentrum katalys

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Catalysis Communications

1566-7367 (ISSN)

Vol. 95 26-30

Kompetenscentrum katalys KCK

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

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

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

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

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

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

Energimyndigheten (22490-3), 2014-01-01 -- 2017-12-31.

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

Högeffektiv Ottomotor med utspädd förbränning II

Energimyndigheten (35561-2), 2015-01-01 -- 2017-12-31.


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