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The influence of surface acidity on NO2 reduction by propane under lean conditions

Hanna Härelind Ingelsten (Institutionen för kemi och biovetenskap ; Kompetenscentrum katalys (KCK)) ; Åsa Hildesson (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Erik Fridell (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för material- och ytkemi, Teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Journal of Molecular Catalysis A: Chemical (1381-1169). Vol. 209 (2004), 1-2, p. 199-207.
[Artikel, refereegranskad vetenskaplig]

This investigation focuses on the influence of surface acidity on the continuous catalytic reduction of NOx by propane under lean conditions. The acidity was varied by studying noble metal free alumina, silica and co-precipitated aluminium-silicates with varying alumina-silica ratio. The catalysts were characterised by isopropylamine temperature programmed desorption (TPD), with respect to NOx reduction (NO2 and propane) and by Fourier Transform Infrared (FTIR) spectroscopy. The isopropylamine TPD was used to determine the sample acidity. The amount of Bronsted acid sites increased with increasing amount of alumina. The sample activity for NOx reduction with propane was found to correlate with the Bronsted-site density. Furthermore, no N2O was formed during the activity studies. The FTIR measurements implied formation of isocyanate species on the surface of the catalyst sample when NO/NO2, propane and oxygen were present in the gas phase. FTIR data also reveal an increasing amount of adsorbates on the surface with increasing amount of alumina in the sample. Moreover, with propane present, NO-species were consumed to a higher extent over samples containing a larger amount of alumina. Our results suggest a connection between the Bronsted-site density and the NOx reduction with propane under lean conditions.

Nyckelord: aluminum-silicate; lean NOx reduction; propane; surface acidity; FTIR



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Denna post skapades 2006-08-29. Senast ändrad 2016-12-06.
CPL Pubid: 8278

 

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Institutioner (Chalmers)

Institutionen för kemi och biovetenskap (1900-2005)
Kompetenscentrum katalys (KCK)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)
Institutionen för material- och ytkemi, Teknisk ytkemi (2002-2004)

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