Selective Catalytic Reduction (SCR) is the most effective method of controlling nitrogen oxide emissions (NOx) from combustion sources. It is a commercially proven flue gas treatment technology that has been demonstrated to remove over 90 percent of the NOx contained in combustion system exhaust gas. Nitrogen oxides contribute to acid rain and smog.

Elimination of NOx creates a healthier environment and meets the most stringent reduction requirements. SCR technology is widely used on different types of combustion systems such as coal fired boilers, simple and combined cycle gas turbines, process boilers, hydrogen reformers, etc. Virtually any hot flue gas containing NOx can be treated effectively with the SCR process as a retrofit or on new equipment.