Elimination of NO on Co ion-exchanged Co center dot Al bimetallosilicate catalyst under excess oxygen condition

Several MFI-type silicates containing Co and Al were synthesized as catalys ts for elimination of NO under excess oxygen condition. Their characteristi cs were assessed by X-ray powder diffraction analysis, adsorption of N-2 to determine the BET surface area, temperature-programmed desorption of NH3, and diffuse reflectance electron absorption. The Co content in as-synthesiz ed Co . Al-silicate had almost no influence on Al content, while the Co con tent in H-Co . Al-silicate decreased with increasing Al content. The cataly tic activity for conversion of NO on H-Co . Al-silicate was improved by Co ion-exchange. The conversion of NO on Co/H-Co . Al-silicate was higher than that on Co/H-Al-silicate, although the conversion of CH4 on both was ident ical. This improvement could be ascribed to appropriate combination of diff erent species in the catalyst. (C) 1998 Elsevier Science B.V. All rights re served.