Selective Catalytic Reduction (SCR)

Nitrogen oxides consist of nitric oxide and nitrogen oxide which are known to cause irritations of the respiratory system and are responsible for the formation of acid rain as well as smog. Due to these reasons there are harsh thresholds by the government in order to minimize the NOx emissions which are mainly caused during combustion processes like in diesel engine applications or stationary applications.

The most established method to reduce the NOx emissions is the utilization of an SCR catalyst (selective catalytic reduction). For this process a reducing agent, usually urea, is used. The aqueous urea solution is injected to the hot exhaust stream and decomposes to ammonia which reacts selectively with the nitrogen oxides to harmless nitrogen in the presence of the catalyst. The temperature plays a key role for the efficiency and the stability of the catalyst. Hence, INTERKAT provides a broad range of SCR catalysts in order to match the individual requirements of the customer. This also includes catalysts for urea hydrolysis and ammonia slip oxidation.

INTERKAT standard SCR coatings:

Product characteristic: Customer benefitApplications
Vanadium based SCR catalyst with adjustable broad operation window High sulphur tolerance
Applications with a temperature in the range of 200-550 °C
All
Long lasting stability at high temperaturesApplications with peak temperatures up to 650 °CAll
Urea hydrolysisprevention of uncomplete urea decomposition depositsAll
Ammonia slip oxidationselective oxidation of ammonia in case of ammonia overdosageAll