Pollution has become a major problem throughout the world. The automotive pollution is responsible highly for the global climatic changes since fifties increased concentration of pollutants in the vehicle emissions poses a serious health hazards to the public. Consequently, the air (prevention & control of pollution) act was passed in India in 1981, and its amendments and emissions control regulations became stringent step by step. Due to increasingly stringent government regulations on vehicle nitrogen oxides (NOx) emission levels the selective catalytic reduction (SCR) of NOx to N2 by hydrocarbons has gained a great deal of attention. Catalytic converters for petrol driven passenger car have now become mandatory for new cars and SCR with ammonia water injection system is used to reduce the exhaust pollution. The project work reports some result of investigations carried out on the operation of ammonia water injection system on exhaust carried out by simulation model to reduce the NOx formation. The present work was done on simulation model of catalytic converter on exhaust system using Comsol multiphysics software. This project report describes the use of catalytic converter and injected ammonia water to reduce the harmful exhaust gas
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