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A Review of Solid Materials as Alternative Ammonia Sources for Lean NOx Reduction with SCR
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From Delphi
The need for improved emissions control in lean exhaust to meet tightening, world-wide NOx emissions standards has led to the development of selective catalytic reduction of NOx with ammonia as a major technology for emissions control. Current systems are being designed to use a solution of urea (32.5 wt %) dissolved in water or Diesel Exhaust Fluid (DEF) as the ammonia source. While DEF or AdBlue® is widely used as a source of ammonia, it has a number of issues at low temperatures, including freezing below -12 oC, solid deposit formation in the exhaust, and difficulties in dosing at exhaust temperatures below 200 oC. Products & Services
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Topics of Interest
Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an...
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As the on-highway vehicle industry begins looking ahead to the 2010 exhaust emissions standards, many engine and exhaust system manufacturers are looking at urea-injected selective catalytic reduction...
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Low-cost lean NOx aftertreatment is one of the main challenges facing high-efficiency gasoline and diesel engines operating with lean mixtures. While there are many candidate technologies, they all...
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Selectrive Catalytic Reduction (SCR) systems will be installed on 100,000 MW of U.S. coal-fired generating capacity by 2004. SCR investment for Nitrogen Oxides (NOx) control will be the largest for...
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The primary requirements of exhaust after treatment systems are low back pressure, low system weight, better emission performance and lower cost. Combinations of these properties provide better engine...
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