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CATALYTIC REDUCTION. Selective catalytic reduction (SCR) means converting nitrogen oxides, also referred to as NO x with the aid of a catalyst into diatomic nitrogen (N 2), and water (H 2 O). A reductant, typically anhydrous ammonia (NH 3), aqueous ammonia (NH 4 OH), or a urea (CO(NH 2)
Materials with this topology are of industrial interest, as potential catalysts for application in the methanol to olefins (MTO) reaction. Recently SSZ-13 has attracted attention as the catalyst for selective catalytic reduction (SCR) of NOx. [8] Actually copper-loading SSZ-13 is industrially applied to the emission control of diesel engines.
Selective catalytic reduction is used to reduce the amount of NO x released into the atmosphere. DEF from a separate tank is injected into the exhaust pipeline, and the exhaust heat decomposes it to ammonia. Within the SCR catalyst, the NO x are reduced by the ammonia into water and nitrogen, which are both nonpolluting. The water and nitrogen ...
Because of the increasing need to limit NO x emissions from diesel engines, technologies such as exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) have been used, however EGR is of limited effectiveness and SCR requires a continuous supply of reductant to the exhaust.
Selective catalytic reduction (SCR) injects a reductant such as ammonia or urea — the latter aqueous, where it is known as diesel exhaust fluid (DEF) — into the exhaust of a diesel engine to convert nitrogen oxides (NO x) into gaseous nitrogen and water.
In 2010, most light-duty diesel manufacturers in the U.S. added catalytic systems to their vehicles to meet federal emissions requirements. Two techniques have been developed for the catalytic reduction of NO x emissions under lean exhaust conditions, selective catalytic reduction (SCR) and the NO x adsorber.
Since it is known that V 2 O 5 can be reduced to VO 2 by SO 2, one likely catalytic cycle is as follows: SO 2 + V 2 O 5 → SO 3 + 2VO 2. followed by 2VO 2 +½O 2 → V 2 O 5. It is also used as catalyst in the selective catalytic reduction (SCR) of NO x emissions in some power plants and diesel engines. Due to its effectiveness in converting ...
BlueTEC is Mercedes-Benz Group's marketing name for engines equipped with advanced NO x reducing technology for vehicle emissions control in diesel-powered vehicles.The technology in BlueTec vehicles includes a selective catalytic reduction (SCR) system that uses diesel exhaust fluid, and a system of NOx adsorbers the automaker calls DeNO x, which uses an oxidizing catalytic converter and ...
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