The selective catalytic reduction (SCR) technology is well established and used worldwide to control the emissions of NOx from stationary sources: it can be broadly described as passing a hot exhaust gas over a catalyst in the presence of nitrogenous reductants, such as ammonia or urea. The SCR is also currently employed to reduce NOx contained in the exhaust gases of internal combustion engines operated with excess air, such as Diesel engines. ... 전체 초록 보기