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Lubricant formulations and methods of lubricating a combustion system to achieve improved emissions catalyst durability

A technology of lubricant and lubricant composition, applied in the directions of lubricating composition, additive, absorption and weighing of utilization substances, etc., can solve problems such as loss of efficiency of automobile emission control system

Active Publication Date: 2010-03-03
AFTON CHEMICAL
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  • Abstract
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AI Technical Summary

Problems solved by technology

For example, over the years, phosphorus from engine oil has volatilized through the combustion chamber and subsequently deposited on the catalyst system of a car, rendering the car's emissions control system ineffective

Method used

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Embodiment Construction

[0004] It has been found that different zinc dialkyldithiophosphates (ZDDPs) exhibit different volatilities and have different effects on automotive emission control catalysts. In other words, the ZDDP will break down as a result of normal wear and use in the engine crankcase. Therefore different ZDDP molecules will break down into different fragment molecules. The decomposition fragments may have substantially different levels of volatility. If the zinc dialkyldithiophosphates and their corresponding decomposition fragments have low volatility, they will accordingly have less adverse effects on the combustion emission control system, since only few phosphorus atoms pass through the combustion system and to the emission control system. In other words, the less volatile the harmful molecule is, the fewer molecules will pass through the combustion system via engine blow-by or simple combustion. Conversely, if the ZDDP and its corresponding decomposition fragments are highly v...

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Abstract

The invention relates to lubricant formulations and methods of lubricating a combustion system to achieve improved emissions catalyst durability. Different zinc dialkyldithiophosphate (ZDDPs) exhibit different volatilities and have different effects on automotive emissions control catalysts. The ZDDPs and their respective decomposition fragments that have low volatility will have a correspondingly lower detrimental effect on combustion emissions control systems, because there are simply fewer phosphorous atoms that will pass through the combustion system to reach the emissions control system.Specifically, it has been discovered that ZDDPs that contain a significant fraction of MIBC ZDDP exhibit significantly lower volatility than other ZDDPs.

Description

technical field [0001] The present invention relates to a lubricant formulation and method for lubricating a combustion system for improved exhaust catalyst durability in an emission control system associated with the combustion system. In particular, the method involves using relatively low amounts of predetermined phosphorus-containing additives in the lubricant to minimize poisoning of the emission control catalyst. The present invention also relates to the detection of TEOST MHT capture volatiles to select specific phosphorus-containing additives that produce the least amount of emission control catalyst poisoning. Background technique [0002] Phosphorus is an element known to be found and incorporated into lubricant compositions for combustion systems. Unfortunately, phosphorus-containing emissions from combustion systems can poison catalyst components of exhaust gas purification systems. In particular, phosphorus emissions from lubricants can poison these catalysts ...

Claims

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Application Information

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IPC IPC(8): C10M137/10G01N5/02C10N40/25C10N30/06C10N30/10
CPCG01N33/28C10N2230/50C10N2230/04C10N2220/12C10M2223/045C10N2230/42C10N2220/13C10M137/10C10N2020/083C10N2020/085C10N2030/04C10N2030/50C10N2030/42
Inventor R·M·希茨G·H·金瑟J·T·罗珀
Owner AFTON CHEMICAL
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