Abstract
Air pollution has become an important worldwide problem. The European Commission credits road and water transport as the major source of NOx pollution, and of being responsible for around 50% of the total air pollution in urban areas. During the last decade, the use of SCR technologies have gained popularity as a method for NOx reduction, the technology is widely considered as one of the solutions for road transport emissions. This paper presents a review of the different SCR system designs derived from the various factors and regulations in the automotive industry which have influenced the technology, along with a parametric study of a proprietary SCR system for heavy duty application.
Highlights
Considering that catalytic emission control has been around for more than 40 years, and Selective CatalyticReaction (SCR) been widely used on stationary plants for the abatement of NOx [1], its introduction into the automotive market dating to the last decade is relatively recent [2].The main purpose of Selective CatalyticReaction (SCR) catalytic converters is the abatement of NOx contaminants, which are poisonous for humans and largely responsive for the catalytic destruction of ozone (O3) in the atmosphere [3]
The main purpose of SCR catalytic converters is the abatement of NOx contaminants, which are poisonous for humans and largely responsive for the catalytic destruction of ozone (O3) in the atmosphere [3]
This problem popularized the use SCR systems using urea based solutions as a conduct of ammonia (NH3) for the reduction NOx contaminants to nitrogen (N2) over a catalyst composed of base metals on diesel engines
Summary
Considering that catalytic emission control has been around for more than 40 years, and Selective Catalytic. It was evident that Hydrocarbon (HC) based catalyst were not sufficient for the reduction of NOx agents on low temperature engines such as the diesel operated ones [1]. This problem popularized the use SCR systems using urea based solutions as a conduct of ammonia (NH3) for the reduction NOx contaminants to nitrogen (N2) over a catalyst composed of base metals on diesel engines. According to the Regulation (EC) No 715/2007, the Euro 6 norm for heavy, medium and light duty engine demands for more than a 50% reduction of NOx contaminants in comparison to Euro 5 (Tab. 1). Such demanding reductions on NOx contaminates demand for further investigation and improvement on SCR reduction methods for light and heavy duty engines [6]
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