Nitrogen oxides (NOX) consist of nitric oxide (NO) and nitrogen dioxide (NO2) 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 governments globally in order to minimize the NOX emissions which are mainly caused during combustion processes like in combustion engines or industrial applications.

The most established method to reduce NOX emissions is the utilization of a SCR catalyst (selective catalytic reduction). For this process a reducing agent (mainly ammonia, NH3), is required. The ammonia is usually formed   by decomposition of 32.5 % aqueous urea solution (trade name “AdBlue”), which is injected into the exhaust pipe upstream of the SCR catalyst. The ammonia reacts selectively with the nitrogen oxides to harmless nitrogen (N2) and water (H2O) in the presence of the catalyst.

Standard SCR reaction with NO only:

4 NH3 + 4 NO + O2         →         4 N2 + 6 H2O

Fast SCR reaction with NO and NO2:

4 NH3 + 2 NO + 2 NO2    →         4 N2 + 6 H2O

Slow SCR reaction with NO2 only:

4 NH3 + 3 NO2               →        3,5 N2 + 6 H2O

INTERKAT provides SCR catalysts based on vanadia /titania and zeolite technology, respectively. Depending on the requirements of the customer we find the optimal catalyst for the application and the specific operation temperature.

Especially our latest development of a high temperature stable SCR catalyst based on the cost-effective and sulphur stable vanadia/titania technology is becoming a leading product for all applications with temperature peaks above 500 °C. A maximum temperature of 650 °C makes this vanadia catalyst unique.

“INTERKAT will always provide the optimal catalyst for your application”