Patent ID: 6821932
Filing Date: 2004-11-23
Classification: C10L,C10M,C10N

Abstract:
A method for reducing the deleterious effect on exhaust emissions after treatment and control devices of at least one contaminant selected from the group consisting of phosphorus, lead, sulfur and compounds thereof in an exhaust stream from the combustion of a hydrocarbonaceous fuel in a combustion system lubricated by a lubricant, said method comprising the steps:(a) lubricating the combustion system with the lubricant comprising a major amount of a base oil of lubricating viscosity and a minor amount of one or more additives comprising (i) at least one organosulfur compound, or at least one organophosphorus compound, or both, and (ii) at least one molybdenum source; (b) combusting in the combustion system the hydrocarbonaceous fuel to produce combustion products comprising at least one material selected from the group consisting of sulfur, lead, phosphorus, and compounds thereof; (c) contacting the molybdenum with at least one of the sulfur, lead, phosphorus, and compounds thereof in the combustion products, whereby the molybdenum interacts with at least one of the sulfur, lead, phosphorus, and compounds thereof.