Patent ID: 7743738

Claim:
In a combustion system that combusts a hydrocarbonaceous fuel and a lubricant to produce an exhaust stream comprising at least one contaminant selected from a group consisting of phosphorous, lead, sulfur, and compounds thereof, a method for reducing deleterious effects of the at least one contaminant on an after treatment and/or a control device, comprising: via a tungsten source, adding tungsten to the lubricant; wherein the lubricant comprises a major amount of a base oil of lubricating viscosity and a minor amount of at least one additive selected from a group comprising at least one of an organosulfur compound and an organophosphorous compound, wherein the tungsten source is selected from a group comprising elemental tungsten, organotungsten, tungsten oxide, sulphur-containing organotungsten, sulphur- and phosphorus-free tungsten compounds, tungsten acids, tungsten trioxide, ammonium ortho tungstate, ammonium metal tungstate, ammonium paratungstate, sodium tungstate, potassium tungstate, tungsten halides, tungsten hexacarbonyl, tungsten ethoxide, tungsten oxychloride, tungsten pentacarbonyl-N-pentylisonitrile, tungsten silicide, cyclomatic tungsten compounds, tungsten organoamines, tungsten phosphenes, organo-oxo-tungstenates, MgWO 4 , CaWO 4 , and ZnWO 4 ; combusting the hydrocarbonaceous fuel and the lubricant in the combustion system, thereby producing the exhaust stream; during or after the combusting, exposing the tungsten to the at least one contaminant; during or after the combusting, scavenging at least some of the at least one contaminant; and as a result of the scavenging, reducing contact between the at least one contaminant and the after treatment system and/or the control device, thereby reducing the deleterious effects of the at least one contaminant on the after treatment system and/or the control device.