Influence of the platinum-support interaction on the direct reduction of NOx under lean conditions

Acke, Filip,1968Chalmers tekniska högskola,Chalmers University of Technology (författare)

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).

Westerberg, Björn,1962Chalmers tekniska högskola,Chalmers University of Technology (författare)
Eriksson, Lars,1965Chalmers tekniska högskola,Chalmers University of Technology (författare)
Johansson, Stefan,1967Chalmers tekniska högskola,Chalmers University of Technology (författare)
Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund (författare)
Fridell, Erik,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)fridell (författare)
Smedler, Gudmund,1956Chalmers tekniska högskola,Chalmers University of Technology (författare)
Chalmers tekniska högskola (creator_code:org_t)

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