Patent ID: 7341447
Filing Date: 2008-03-11
Classification: C10L,C10M,C10N

Abstract:
1. A method for reducing the deleterious effect 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 stoichiometric combustion system lubricated by a lubricant, and the combustion system excluding a two-stroke engine, 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 manganese source; and wherein the lubricant is added to the combustion system separate from the fuel; (b) combusting in the combustion system the hydrocarbonaceous fuel and the lubricant to produce combustion products comprising manganese and at least one material selected from the group consisting of sulfur, lead, phosphorus, and compounds thereof; (c) contacting the manganese with the sulfur, lead, phosphorus, and compounds thereof in the combustion products, whereby the manganese interacts with the sulfur, lead, phosphorus, and compounds thereof.