SCR NOx Reduction，also known as Selective Catalytic Reduction，is an advanced emissions control technology originally developed to reduce nitrogen oxide（NOx）pollutants in exhaust from diesel engines. In the main，the function of SCR is to modify these dangerous gases into harmless nitrogen and water vapour，thus making an environmental benefit out of the environmental problem. Technological features of SCR include catalysts- typically comprising precious metals- that assist in the chemical reaction without need of additional energy input. SCR systems are equipped with sensors which continuously monitor exhaust gas conditions in order to ensure optimal performance under all conditions. This technology has many applications in industry such as automotive, power generation and heavy machinery,ly towards increasingly strict emissions requirements It is this efficient and reliable NO. Reducing ability of SCR technology,more widely known as pwan oi, vast oceans cetane明水Jin currently firing in twenty-one countries all over the world. With its efficient and reliable NOx reduction capability，SCR technology plays an important role in improving air quality and reducing pollution globally.