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Improved low-temperature activity of silver-alumina for lean NOx reduction–effects of Ag loading and low-level Pt doping

Fredrik Gunnarsson (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Hannes Kannisto (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Hanna Härelind (Institutionen för kemi- och bioteknik, Teknisk ytkemi ; Kompetenscentrum katalys (KCK))
Applied Catalysis B: Environmental (0926-3373). Vol. 152-153 (2014), p. 218-225.
[Artikel, refereegranskad vetenskaplig]

This study focuses on the effect of silver loading and low-level platinum doping on the distribution of silver species, the hydrocarbon activation, and the low-temperature activity for lean NOx reduction over silver-alumina catalysts. Sol-gel prepared Ag/Al2O3 samples, with varying silver loading and doped with trace amounts of platinum, were evaluated as HC-SCR catalysts using n-octane as reductant in a synthetic gas-bench reactor. In addition, the samples were characterized using X-ray photoelectron spectroscopy, ultraviolet visible spectroscopy, and the specific surface area was determined using nitrogen sorption. The study shows that as the samples are doped with trace-amounts of platinum, the activity for lean NOx reduction at low temperatures is enhanced. The catalyst composition that displays the highest activity for NOx reduction is a 2 wt% Ag/Al2O3 sample doped with 500 ppm platinum. This catalyst displays the highest low-temperature activity, most likely owing to an increased ability to adsorb and partially oxidize the hydrocarbon reductant, which is attributed to the Pt doping. Adsorption of a higher amount of hydrocarbons could result in that a lower amount of reducing agent is required for Pt doped Ag-alumina catalysts as compared to un-doped ones, which is beneficial with respect to fuel efficiency.

Nyckelord: Silver-alumina, Ag/Al2O3, HC-SCR, Platinum doping, Lean NOx reduction



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Denna post skapades 2014-01-31. Senast ändrad 2016-12-06.
CPL Pubid: 193314

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Teknisk ytkemi (2005-2014)
Kompetenscentrum katalys (KCK)

Ämnesområden

Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kinetik
Materialkemi
Katalys

Chalmers infrastruktur

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Lean NOx reduction over silver-alumina from lab-scale to real conditions - Effects of reducing agent and catalyst composition