Influence of the platinum-support interaction on the direct reduction of NOx under lean conditions
Artikel i vetenskaplig tidskrift, 1998

Catalysts containing Pt supported on SiC, Al2O3 and ZSM-5 were prepared and studied for NOx reduction by C3H6 in Oz excess under transient (temperature ramps) and steady-state conditions. The maximum NOx reduction activity in the heating ramp experiments was similar for Pt/SiC and Pt/ZSM-5, while Pt/Al2O3 showed higher maximum activity. Both N-2 and N2O formation was observed for all catalysts, although the respective amounts varied with the investigated system. Highest Nz selectivity was observed for Pt/Al2O3. When the NOx reduction activity was studied under steady-state conditions the activity of Pt/Al2O3 decreased substantially (mainly due to a loss in N-2 production). Pt/ZSM-5 became somewhat more selective towards Na production whereas the activity and selectivity of Pt/SiC remained at about the same values as far the heating ramp experiments. Adsorbed species on the surface of the different catalysts were investigated using in-situ FTIR in order to obtain information about the reaction mechanisms. The adsorption of species on Pt/SiC was negligible, while a number of absorption bands were observed for Pt/Al2O3 (N and C containing species, and -NCO) and Pt/ZSM-5 (HC).

HYDROCARBONS

SELECTIVE CATALYTIC REDUCTION

PROPYLENE

EXCESS OXYGEN

ADSORPTION

SPECTROSCOPY

NITRIC-OXIDE

CO

RH/AL2O3

STABILITY

Författare

Filip Acke

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för oorganisk miljökemi

Björn Westerberg

Kompetenscentrum katalys (KCK)

Institutionen för kemisk reaktionsteknik

Lars Eriksson

Kompetenscentrum katalys (KCK)

Institutionen för teknisk kemi

Stefan Johansson

Chalmers, Teknisk fysik

Kompetenscentrum katalys (KCK)

Magnus Skoglundh

Institutionen för teknisk kemi

Kompetenscentrum katalys (KCK)

Erik Fridell

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Gudmund Smedler

Institutionen för kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Studies in Surface Science and Catalysis

0167-2991 (ISSN)

Vol. 116 285-294

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