With reference to Selective Catalytic Reduction technology an emission control technology required f...........

Environment and Ecology Environment- Institutional Structure

With reference to Selective Catalytic Reduction technology, an emission control technology required for adopting Bharat Stage VI emission standards,consider the following statements:

1. It reduces the levels of SO2 in vehicular emissions.

2. It uses aqueous ammonia as a reducing agent within a catalyst system.

Which of the statements given above is/are correct?

1 Only

2 Only

Both 1 and 2

Neither 1 nor 2

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Explanation:

BS-VI vehicles have to be equipped with an SCR (selective catalytic reduction) module to reduce oxides of nitrogen, which is done by injecting an aqueous urea solution (AUS 32, which contains ammonia) into the system when the exhaust is moving.SCR technology is designed to permit nitrogen oxide (NOx) reduction reactions to take place in an oxidizing atmosphere. It is
called "selective" because it reduces levels of NOx using ammonia as a reductant within a catalyst system. SCR technology alone can achieve NOx reductions up to 90 percent.