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Water–gas-shift assisted ammonia formation over Pd/Ce/alumina

Emma Adams (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Tobias Elmøe ; Per-Anders Carlsson (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Catalysis Today (0920-5861). (2017)
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Catalytic exhaust aftertreatment; Passive-SCR; NOx reduction; NH3 formation

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Denna post skapades 2017-09-01. Senast ändrad 2017-09-14.
CPL Pubid: 251572