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US 2022/0088581 A1Published application
Superhydrophobic coatings for deposit reduction in selective catalytic reductant systems
AssigneeSouthwest Research Institute
InventorsRyan HARTLEY, Shekhar VATS, Michael A. MILLER
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Abstract
Superhydrophobic coatings to reduce deposit formation of diesel exhaust fluid (DEF) within selective catalytic reduction (SCR) systems.
Claims19
A method for reducing deposits on the internal surface of SCR component(s) comprising:
- providing an SCR component having an internal volume and internal surface and creating a vacuum within the interior volume of the SCR component;
- supplying gas to the interior volume of said SCR component wherein the gas includes a plasma precursor in the gas phase;
- biasing the SCR component to ground;
- forming a plasma along the length of said SCR component;
- generating positive ions of said plasma precursor which are deposited on the internal surface of said SCR component;
- forming a coating on said internal surface of said SCR component wherein said coating exhibits a water contact angle in oil of greater than 120°.
3 more elements
A coated SCR component comprising:
- a SCR component having an internal surface configured to be exposed to diesel emission fluid;
- a carbo-siloxane coating disposed on said SCR component internal surface, wherein said coating has a water contact angle of greater than 120°, wherein said coating comprises 50 to 60 atomic percent carbon, 20 to 30 atomic percent oxygen, and 15 to 25 atomic percent silicon, wherein said coating, at a depth of up to 300 Angstrom, comprises:
- (a) Si—O— at a relative concentration of 38.5(±12) %;
- (b) Si—C at a relative concentration of 25.6 (±5) %;
- (c) C—O at a relative concentration of 4.5 (±3) %;
- and (d) C—C at a relative concentration of 31.4 (±2) %.
3 more elements
Dependencies are inferred from the claim text.