Author : Akash K. Ingole, Deodatta Dixit and Sunil V. Dingare

With globalization and improved economic conditions, there has been a huge increase in the number of vehicles coming out of manufacturing plants. This has led to an exponential increase in the amount of exhaust gases in the environment. The major gases having maximum amount of harmful influence on the environment are unburned hydrocarbons, carbon monoxide, oxides of nitrogen, particulate matter etc. Various technologies have been developed to tackle these gases both in petrol and in diesel engines. Selective Catalytic Reduction is one such advanced emissions control technology used for reduction of NOx emissions in diesel engines. SCR system injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine thus decomposing NOX into inert nitrogen. This paper reviews the use of various catalysts in SCR technology for reduction of NOx from diesel engine exhaust. The challenge

Keywords: Selective Catalytic Reduction, NOx emissions, liquid-reductant agent, catalyst