Water–gas-shift assisted ammonia formation over Pd/Ce/alumina
Journal article, 2018

We report experimental results for the water–gas-shift assisted formation of ammonia from nitric oxide over alumina supported palladium, modified with various amounts (0–38 wt.%) of cerium. Static and transient flow reactor experiments were performed in order to identify the effects of temperature and the presence of oxygen on the activity for ammonia formation over the catalysts. The water–gas-shift reaction is enhanced with increasing cerium content, thus providing more hydrogen for ammonia formation. During transient operation at temperatures above 350 °C, a slight delay in ammonia formation is observed over the sample containing the highest cerium loading due to its (relatively) high dynamic oxygen storage capacity. At temperatures below 175 °C, N2O formation is preferred over NH3 formation. This work highlights the importance of balancing the effects that ceria influences when choosing the ceria loading for ammonia formation in passive-SCR applications.

NOx reduction

Catalytic exhaust aftertreatment


NH3 formation


Emma Adams

Competence Centre for Catalysis (KCK)

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Magnus Skoglundh

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Competence Centre for Catalysis (KCK)

Tobias Elmøe

Haldor Topsoe

Per-Anders Carlsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Competence Centre for Catalysis (KCK)

Catalysis Today

0920-5861 (ISSN)

Vol. 307 169-174

High efficient Otto engine with diluted combustion II

Swedish Energy Agency (35561-2), 2015-01-01 -- 2017-12-31.

Competence Centre for Catalysis

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

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

Swedish Energy Agency (22490-3), 2014-01-01 -- 2017-12-31.

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

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

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

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

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

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