selective catalytic reduction for nox control
SCR (Selective Catalytic Reduction) for NOx control is an advanced technology for reducing emissions. It strives to minimize the amount of gaseous nitrogen oxides (NOx) that are released into our atmosphere. SCR's role is to convert these poisoned gases into benign nitrogen and water, using a catalyst to guide the necessary chemical reactions (Fig. 1). Technological features of SCR systems include the use of urea or ammonia as a reducing agent, catalyst materials with excellent high temperature performance and complex control systems to control the injection of the reducing agent. The power generation, cement making and heavy transportation industries all have large amounts of NOx emitted in their combustion processes. By reducing NOx effectively, SCR technology helps industries to meet increasingly stringent environmental regulations more easily while also improving air quality and public health.