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Mechanistic investigation of the reduction of NOx over Pt-and Rh-based LNT catalysts

L. Kubiak ; L. Castoldi ; L. Lietti ; Stanislava Andonova (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Louise Olsson (Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK))
Catalysts (2073-4344). Vol. 6 (2016), 3, p. Art. no. 46.
[Artikel, refereegranskad vetenskaplig]

The influence of the noble metals (Pt vs. Rh) on the NOx storage reduction performances of lean NOx trap catalysts is here investigated by transient micro-reactor flow experiments. The study indicates a different behavior during the storage in that the Rh-based catalyst showed higher storage capacity at high temperature as compared to the Pt-containing sample, while the opposite is seen at low temperatures. It is suggested that the higher storage capacity of the Rh-containing sample at high temperature is related to the higher dispersion of Rh as compared to Pt, while the lower storage capacity of Rh-Ba/Al2O3 at low temperature is related to its poor oxidizing properties. The noble metals also affect the catalyst behavior upon reduction of the stored NOx, by decreasing the threshold temperature for the reduction of the stored NOx. The Pt-based catalyst promotes the reduction of the adsorbed NOx at lower temperatures if compared to the Rh-containing sample, due to its superior reducibility. However, Rh-based material shows higher reactivity in the NH3 decomposition significantly enhancing N2 selectivity. Moreover, formation of small amounts of N2O is observed on both Pt- and Rh-based catalyst samples only during the reduction of highly reactive NOx stored at 150 °C, where NOx is likely in the form of nitrites.

Nyckelord: NOx release, NOx storage reduction, PtBa/Al2O3, RhBa/Al2O3



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Denna post skapades 2016-05-10. Senast ändrad 2017-09-14.
CPL Pubid: 236152

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Kemisk reaktionsteknik
Kompetenscentrum katalys (KCK)

Ämnesområden

Transport
Kemi

Chalmers infrastruktur