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It's a method for converting NOx gases to N2 and H2O with the help of a catalyst and using usually ammonia as a reducing agent.

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Q: What is selective catalytic reduction?
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Related questions

What does it mean when water comes out the exhaust on a diesel?

Depends on what emissions standards it's compliant with. If you have an EPA2010 or Euro6 compliant engine, water is just a byproduct of the Selective Catalytic Reduction system.


What is def fluid for?

DEF (diesel exhaust fluid) is used as a consumable in SCR (selective catalytic reduction) in order to lower NOx concentration in the diesel exhaust emissions from diesel engines.


What are the main uses for the MagnaFlow Catalytic Converter?

The main usage of a MagnaFlow Catalytic Converter or any other catalytic converter is commonly the reduction of toxic emissions in the exhaust systems in cars.


How are cummins on highway engines meeting current emission regulations?

Some of it wasn't by their design... the switch to Ultra Low Sulphur Diesel in 2007, for instance. For the remainder, Cummins uses an aftertreatment system, consisting of a Diesel Particulate Filter, Diesel Exhaust Fluid dosing, and Selective Catalytic Reduction.


Are catalytic converters required on diesel cars?

From 1994 onwards, they were required to have a Diesel Oxidation Catalyst. From 2008 onwards (in the US), a set of emissions standards requiring highway diesel engines to have a Diesel Particulate Filter went into effect. From 2012 onwards, engines over a certain displacement required a complete aftertreatment system, with a DOC, DPF, and Selective Catalytic Reduction, which uses Diesel Exhaust Fluid (DEF).


What has the author F S Boericke written?

F. S. Boericke has written: 'Equilibrium in the reduction of ferrous chromite by hydrogen and energy requirements in the selective reduction of iron in chromite' -- subject(s): Chromite


What is dual bed catalytic converter?

2 compartment for reaction, one for oxidizing of HC and CO, and other for NOx reduction.


What type of reagent is required to convert SO2 to S?

The catalytic reduction of sulfur dioxide with methane can convert SO2 to sulfur.


What reaction is catalysed by a catalytic converter?

Oxidation of carbon monoxide to carbon dioxide. Reduction of nitrogen monoxide back to nitrogen. Oxidation of hydrocarbons to water and carbon dioxide.


Would a catalytic converter reduce car tax?

Generally, a catalytic converter is fitted to a new vehicle to comply with regulations for the jurisdiction. There are few locations where a reduction in government tax will be offered for fitting one to a car that did not previously have one. For a definitive answer, you will need to contact your taxation or licencing agency.


What has the author David Richard Davies written?

David Richard Davis has written: 'Studies in the catalytic reduction and decomposition of nitric oxide'


Use of urea at coal fired power plants?

Here is a novice explanation. Urea is used as a reactionary agent, reductant, in both Selective Catalyst Reduction (SCR) and Selective Non-Catalyst Reduction systems (SNCR) in order to reduce NO2 emissions and convert them into CO2 and water. Urea in an SCR is sprayed into the Flue Gasses before it flows through the catalyst, carbon blocks with many holes. In an SNCR the Urea is sprayed directly into the Fire Box, or Furnace in a place as to be at a certain temperature in order to achieve the same result without the catalytic blocks and is then far less expensive to install, but much more complex to control, as reaction temperatures and distribution amounts are key in the SNCR in order for it to work. In place of Urea, Ammonia may also be used.