Selective Catalytic Reduction
EnviCat® SCR
Selective Catalytic Reduction (SCR) is a robust and cost effective technology for reduction of NOx from diesel exhaust. The NOx reacts with NH3 and is reduced to nitrogen and water even in the presence of oxygen. SCR is widely accepted as the best available control technology. Engine tuned for SCR, NOx control, offers high fuel efficiency.
Süd-Chemie offers a variety of innovative SCR catalysts to reduce NOx Emissions over a wide span of operating temperatures from 200°C to 600°C with proven durability.
Süd-Chemie’s EnviCat® SCR series are designed to suppress the formation of N2O even at near complete conversion of NH3. EnviCat® VWT SCR catalysts can resist poisoning from SO2 and alkalies and can be used effectively even with high “S” diesel fuel (500 ppm S).
Süd-Chemie’s EnviCat® SCR catalysts can be supplied on both Ceramic and Metallic substrates.
EnviCat® SCR catalysts systems are also available with an upstream urea Hydrolysis catalyst and a downstream Ammonia slip catalyst.
EnviCat® Hydrolysis catalyst
The hydrolysis catalyst is a base metal oxide catalyst formulated to convert the aqueous urea (Diesel Exhaust Fluid) into ammonia upstream of the SCR and enhances the low temperature performance of the system. It allows full utilization of the SCR brick as the inlet portion of the catalyst is not required to decompose and hydrolyze the urea. Süd-Chemie offers the hydrolysis catalyst as a separate brick as well as a coated zone at the inlet end of the SCR catalyst.
EnviCat® Ammonia Slip Catalyst
The ammonia slip catalyst is a precious metal catalyst formulated to control ammonia slip, typically to below 10 ppm. The ammonia slip catalyst becomes important when the SCR systems are designed for +90% of NOx conversion and need to operate with high ammonia to NOx ratio. It is positioned after the SCR reactor and is formulated to optimize the oxidation of Ammonia to Nitrogen and suppress the selectivity to undesirable side products such as N2O and NO.
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