US 12,448,582 B2
Methods of improving the performance of combustion engine after-treatment devices
Ashutosh Gupta, Henrico, VA (US); and Sheng Jiang, Glen Allen, VA (US)
Assigned to Afton Chemical Corporation, Richmond, VA (US)
Filed by Afton Chemical Corporation, Richmond, VA (US)
Filed on Apr. 6, 2023, as Appl. No. 18/296,477.
Prior Publication US 2024/0336862 A1, Oct. 10, 2024
Int. Cl. C10M 139/04 (2006.01); B01D 53/94 (2006.01); C10M 169/04 (2006.01); F01N 3/021 (2006.01); C10N 40/25 (2006.01)
CPC C10M 139/04 (2013.01) [B01D 53/9445 (2013.01); C10M 169/04 (2013.01); F01N 3/021 (2013.01); B01D 2255/908 (2013.01); B01D 2258/012 (2013.01); C10M 2203/003 (2013.01); C10M 2227/04 (2013.01); C10N 2040/255 (2020.05)] 9 Claims
OG exemplary drawing
 
1. A method of improving the performance of an after-treatment device for a combustion engine, the method comprising:
lubricating the combustion engine with a lubricating oil composition and combusting a fuel in the lubricated engine generating an exhaust stream including soot and/or ash particles derived from the combustion, wherein the lubricating oil composition includes one or more base oils of lubricating viscosity and an additive package including at least one oil-soluble silicon-containing compound providing from about 150 to about 250 ppm of silicon to the lubricating oil composition and wherein the silicon-containing compound is selected from undecyltriethoxysilane, tetradecyltriethoxysilane, hexadecyltrimethoxy silane, or combinations thereof and wherein the lubricating oil composition includes greater than 1 weight percent to 6 weight percent of zinc dialkyldithiophosphate;
contacting the after-treatment device with the exhaust stream including the soot and/or the ash particles from the combustion;
measuring oxygen storage capacity and/or CO T50 light-off temperature of the after-treatment device after at least about 120,000 miles of operation; and
when measured by oxygen storage capacity, then the oxygen storage capacity of the after-treatment device after at least about 120,000 miles of operation is no more than 30 percent less than an initial oxygen storage capacity of the after-treatment device; or
when measured by CO T50 light-off temperature, then the CO T50 light-off temperature of the after-treatment device after at least about 120,000 miles of operation is no more than 5 percent higher than an initial CO T50 light-off temperature of the after-treatment device.