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US 2021/0293169 A1Published application
Combined Catalyst Precursor/Surfactant Mixture For Reductant Urea Solution For Selective Catalytic Reduction
AssigneeSouthwest Research Institute
InventorRyan Christian HARTLEY
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Abstract
A dosing composition and method for treatment of reductant urea solutions utilizing organometallic catalyst precursors in combination with one or more surfactants to promote decomposition of relatively high molecular weight deposits which deposits may otherwise reduce selective catalytic reduction efficiency.
Claims17
A method for reducing deposits in a diesel engine exhaust system comprising:
- providing a diesel emission fluid (DEF) containing an aqueous based urea solution including a catalyst precursor comprising a water soluble organometallic compound in combination with a surfactant;
- introducing said diesel emission fluid into the diesel exhaust wherein said urea converts to ammonia and isocyanic acid;
- converting the isocyanic acid to ammonia wherein said ammonia is provided to a selective catalytic reduction system and reacts with said oxides of nitrogen and provides nitrogen and water and reducing the formation of deposits in said engine exhaust system.
A method for reducing deposits in a diesel engine exhaust system comprising:
- providing a diesel emission fluid (DEF) containing an aqueous based urea solution including a catalyst precursor comprising a water soluble organometallic compound present in said solution at a level of 0.01 wt. % to 25.0 wt. % in combination with a surfactant present in said solution at a level of 0.01 wt. % to 10.00 wt. %;
- introducing said diesel emission fluid into the diesel exhaust wherein said urea converts to ammonia and isocyanic acid;
- converting the isocyanic acid to ammonia wherein said ammonia is provided to a selective catalytic reduction system and reacts with said oxides of nitrogen and provides nitrogen and water and reducing the formation of deposits in said engine exhaust system.
A formulation for reducing deposits in a diesel emissions exhaust system comprising:
- an aqueous based solution of urea;
- a water soluble organometallic precursor present in said aqueous based solution of urea at a level of 0.01 wt. % to 25.0 wt. %;
- and
- a surfactant present in said aqueous based urea solution at a level of 0.01 wt. % to 10.0 wt. %.
1 more element
Dependencies are inferred from the claim text.