A multiple-active-site Cu/SSZ-13 for NH3-SCO: Influence of Si/Al ratio on the catalytic performance

Abstract The Cu/SSZ-13 catalyst can provide multiple active sites for the ammonia selective catalytic oxidation (NH 3 -SCO), the influence of which can be tuned by varying the Si/Al ratio. The latter parameter was found to influence the surface acidic property and the Cu species distribution, which are critical for NH 3 adsorption and activation. It was found that both CuO and isolated Cu 2+ ions coexist in Cu/SSZ-13 catalyst. The selected Si/Al-20 sample with the highest content of CuO species and abundant acidity exhibited the best NH 3 -SCO performance.