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Compression Ignition(CI) engines are generally used in many areas like automobile industry, locomotive industry, power generation etc. due to its high break power output and thermal efficiency. An oxide of nitrogen (NOx) is one of the most hazardous pollutants which come out from diesel IC engine through tail pipe. Emission of nitrogen oxide (NOx) contribute significantly to our environment, which is a savior environmental problem of NOx which reacts with in the air to form nitric acid (HNO3), contributing to soil eruption and water acidification in sensitive and metropolitan areas. Various present technologies available for NOx reduction either increases other polluting gas emission on increase fuel consumption in an IC engine. Selective catalyst reduction systems (SCR) are the most effective and commonly used post combustion NOx reduction processes available in automobile and power generation sector. SCR utilizes a chemical reaction where vaporized ammonia (NH3) is collected from the mixture of Urea and distilled water. Various catalysts are injected into the exhaust gases. The prime objective is to convert nitrogen oxide (NOx) to nitrogen (N2) and water (H2O).The existing SCR system is a modified by adding some of the component and use various catalysts injected in tail pipe through feed pump. It has been observed that the NOx is reduced due to new SCR system. This process is called as deNOxtation process. In this SCR system denotation level has been reduced, and also contribute to reducing NOx by 65 to 70%.

DESIGN AND DEVELOPMENT OF SCR SYSTEM FOR NOX REDUCTION BY USING VARIOUS CATALYSTS