SOLID SCR<sup>®</sup>: Demonstrating an Improved Approach to NOx Reduction via a Solid Reductant

Lacin, Figen; Kotrba, Adam; Hayworth, Granville; Sullivan, H.H.; Tatur, Marek; Jacques, Jason; Tomazic, Dean; Cho, Hoon

doi:10.4271/2011-01-2207

Cited by 25 publications

(13 citation statements)

References 7 publications

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“…Compared to the water based solution of urea (Diesel Exhaust Fluid (DEF), AdBlue ® or AUS 32) the gaseous ammonia can be introduced into the exhaust gas already from a temperature of 100–140 °C in order to have high NO x reduction efficiency. This temperature is lower than the minimum exhaust gas temperature of around 200 °C that is required for the injection of urea solution to ensure a complete decomposition and hydrolysis of urea to ammonia and to avoid catalyst deactivation, by-products and deposits ( Brack et al, 2016 , Guan et al, 2014 , Lacin et al, 2011 , Kim et al, 2014 ). While AdAmmine™ uses a formulation based on strontium chloride as carrier material, other solids have been considered in the past such as solid urea, ammonium salts (ammonium carbamate and ammonium carbonate), and other metal ammine chloride salts (magnesium ammine chloride, calcium ammine chloride, and strontium ammine chloride).…”

Section: Methodsmentioning

confidence: 96%

“…While AdAmmine™ uses a formulation based on strontium chloride as carrier material, other solids have been considered in the past such as solid urea, ammonium salts (ammonium carbamate and ammonium carbonate), and other metal ammine chloride salts (magnesium ammine chloride, calcium ammine chloride, and strontium ammine chloride). Solid storage materials generally provide an equivalent number of moles of NH 3 to urea solution in roughly half to one third the volume or the mass ( Johannessen et al, 2008 , Lacin et al, 2011 ).…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

Giechaskiel

Suarez-Bertoa

Lähde

et al. 2018

Environmental Research

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The Horizon 2020 prize for the “Engine Retrofit for Clean Air” aims at reducing the pollution in cities by spurring the development of retrofit technology for diesel engines. A Euro 5 passenger car was retrofitted with an under-floor SCR (Selective Catalytic Reduction) for NOx catalyst in combination with a solid ammonia based dosing system as the NOx reductant. The vehicle was tested both on the road and on the chassis dynamometer under various test cycles and ambient temperatures. The NOx emissions were reduced by 350–1100 mg/km (60–85%) in the laboratory depending on the test cycle and engine conditions (cold or hot start), except at type approval conditions. The reduction for cold start urban cycles was < 75 mg/km (< 15%). The on road and laboratory tests were inline. In some high speed conditions significant increase of ammonia (NH3) and nitrous oxide (N2O) were measured. No effect was seen on other pollutants (hydrocarbons, carbon monoxide and particles). The results of the present study show that retrofitting high emitting vehicles can significantly reduce vehicle NOx emissions and ultimately pollution in cities.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

Giechaskiel

Suarez-Bertoa

Lähde

et al. 2018

Environmental Research

View full text Add to dashboard Cite

show abstract

“…For the future work, a more accurate SCR physical model, especially for NH 3 slip estimation, is expected. Improved sensors and actuators always leading to chances of control improvement, the ammonia storage measurement technology 25,26 or gas phase NH 3 injection 27 all may contribute to the SCR modeling and state observation. Another approach is to introduce longterm model adaption techniques, which is very important to help to adapt the system aging characteristics and ensure the convergence of model-based control.…”

Section: Resultsmentioning

confidence: 99%

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Yuan

Gao

Wang

2014

International Journal of Engine Research

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To meet the future emission legislations, selective catalytic reduction aftertreatment system becomes a leading aftertreatment technique for heavy-duty diesel engines. In this article, a two-cell selective catalytic reduction model is first calibrated and verified on an experimental test bench. In order to regulate the ammonia coverage ratio in a proper range, an ammonia storage control is proposed based on the selective catalytic reduction model. The problem of NH 3 slip during temperature rise is discussed and a corresponding perturbation injection control is proposed to buffer the sudden change in selective catalytic reduction ammonia storage capability. The NH 3 slip control performance of the proposed strategy is experimentally validated in European Transient Cycle.

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“…Due to the electrical heating principle, an extra fuel consumption of 1 -3.5 % has been observed. A similar setup in which a heat transfer medium was also sprayed from below on solid ammonium carbamate was presented by Lacin et al [106]. The system was tested on a Dodge RAM pickup truck motorized by a 5.9 L 6-cylinder diesel engine.…”

Section: Alternative Precursor For Ammonia Generationmentioning

confidence: 99%

Potential Technical Approaches for Improving Low‐Temperature NO_x Conversion of Exhaust Aftertreatment Systems

Braun

Gebhard

Matysik

et al. 2018

Chemie Ingenieur Technik

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Lean‐burn engines, such as diesel engines, are widely used in mobile and stationary applications. Operation of lean‐burn engines leads to formation of distinct amounts of nitrogen oxides (NO and NO2). Efficient aftertreatment is mandatory to meet legal requirements, especially at low exhaust temperatures, as for the future a decline of the exhaust temperature level can be predicted due to improved engine efficiencies. Within this review, potential technical solutions to enhance the DeNOx‐aftertreatment efficiency at low exhaust temperatures are presented.

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SOLID SCR^®: Demonstrating an Improved Approach to NOx Reduction via a Solid Reductant

Cited by 25 publications

References 7 publications

Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Potential Technical Approaches for Improving Low‐Temperature NO_x Conversion of Exhaust Aftertreatment Systems

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SOLID SCR®: Demonstrating an Improved Approach to NOx Reduction via a Solid Reductant

Cited by 25 publications

References 7 publications

Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

Evaluation of NOx emissions of a retrofitted Euro 5 passenger car for the Horizon prize “Engine retrofit”

A novel NH3 slip control for diesel engine selective catalytic reduction aftertreatment system

Potential Technical Approaches for Improving Low‐Temperature NOx Conversion of Exhaust Aftertreatment Systems

Contact Info

Product

Resources

About

SOLID SCR^®: Demonstrating an Improved Approach to NOx Reduction via a Solid Reductant

A novel NH₃ slip control for diesel engine selective catalytic reduction aftertreatment system

Potential Technical Approaches for Improving Low‐Temperature NO_x Conversion of Exhaust Aftertreatment Systems