Ag/Al2O3 was studied as a HC-SCR (Hydrocarbon - Selective Catalytic Reduction) catalyst for diesel application[1, 2 and 3]. Performance required of (or from) this catalyst is high NOx conversion with high thermal durability and sulfur resistance. Also low HC slip is desired. The Ag/Al2O3 system was improved by addition of additives.In the diesel 13-mode (Japan) evaluation, improved Ag/Al2O3 catalyst showed higher de-NOx activity (>50%) compared to the original when fresh. Improved Al2O3 catalyst showed smaller hysteresis of de-NOx activity between ramping up and down the temperature and smaller amount of HC slip.To study the improvement effect, interactions between the HC and catalyst were investigated by TG/DTA-MS (define) and FT-IR (define). TG/DTA measurement results showed that HC/O2 reaction was restrained in the improved catalyst. These results suggest that there was sufficient of HC for NOx reduction on the improved catalyst.


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    Title :

    Development of deNOx Catalyst Based on Ag/Al2O3 Catalyst for Diesel Applications


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Spring Fuels & Lubricants Meeting & Exhibition ; 2002



    Publication date :

    2002-05-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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