Methods of improving the performance of combustion engine after-treatment devices

Patent metadata

Field	Value
Publication number	US-12448582-B2
Application number	US-202318296477-A
Country	US
Kind code	B2
Filing date	Apr 6, 2023
Priority date	Apr 6, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

The present disclosure provides for methods of improving the performance of a combustion engine after-treatment device, such as particulate filters and/or three-way catalyst systems, over its useful life by using a lubricating oil composition including one or more base oils of lubricating viscosity and an additive package with increased amounts of least one oil-soluble silicon-containing compound.

First claim

What is claimed is:

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 T 50 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 T 50 light-off temperature, then the CO T 50 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 T 50 light-off temperature of the after-treatment device.

2. The method of claim 1 , wherein the after-treatment device is selected from a three-way catalytic converter, a particulate filter, or combinations thereof.

3. The method of claim 1 , wherein the combustion engine is a gasoline engine or a diesel engine.

4. The method of claim 1 , wherein the soot or ash particles have a diameter of about 10 nm or less.

5. The method of claim 4 , wherein the soot or ash particles aggregate into particles having a diameter up to 200 micrometers.

6. The method of claim 1 , wherein the exhaust stream has 1×10 12 to 1×10 13 of soot and/or ash as measured by particulate number (PN) during hot operation.

7. The method of claim 1 , wherein the lubricating oil composition has a calculated SASH value of 0.4 to 2.0 weight percent.

8. The method of claim 1 , wherein the oil-soluble silicon-containing compound is hexadecyltrimethoxysilane.

9. The method of claim 8 , wherein the oil-soluble silicon-containing compound provides about 180 to about 220 ppm of silicon to the lubricating oil composition.

Assignees

• Afton Chemical Corp

Inventors

• Gupta Ashutosh
• Jiang Sheng

Classifications

• F01N3/021

  by means of filters · CPC title

• C10M2227/04

  having a silicon-to-carbon bond, e.g. organo-silanes · CPC title

• C10M2203/003

  used as base material · CPC title

• C10M169/04

  Mixtures of base-materials and additives · CPC title

• B01D2258/012

  Diesel engines and lean burn gasoline engines · CPC title