Which method is commonly used for removing NOx?

Selective catalytic reduction (SCR) is a widely recognized method for removing nitrogen oxides (NOx) from flue gases produced by combustion processes. This technology involves injecting a reductant, typically ammonia or urea, into the flue gas stream. The NOx reacts with the injected reductant in the presence of a catalyst, often made of materials such as platinum or vanadium, resulting in the conversion of NOx into nitrogen and water, which are harmless and can be safely released into the atmosphere.

The effectiveness of SCR systems in reducing NOx emissions makes them particularly valuable in industrial applications, power plants, and vehicles, where regulations concerning air quality are stringent. This method is favored because it can achieve significant reductions in NOx levels, often reaching efficiencies of over 90%, depending on system design and operation conditions.

Other methods mentioned in the choices are not specifically targeted for NOx removal. Fluidized bed combustion is primarily used for the efficient combustion of solid fuels and can lead to lower NOx emissions due to its operational characteristics, but it does not actively remove NOx after it has formed. Electrostatic precipitators are designed to control particulate matter in emissions and do not address gaseous pollutants like NOx. Enhanced filtration systems are more geared toward