Methane oxidation catalyst and method of using same
AssigneeHis Majesty the King In Right of Canada, AS Represented By the Minister of Natural Resources
InventorsGianni Caravaggio, Lioudmila Nossova
Life of this patent
Estimating the term…
Abstract
Provided herein is a methane oxidation catalyst having a support comprising alumina doped with lanthanum and comprising platinum and palladium as active phases. The platinum and palladium are present in the catalyst at an amount effective for producing an exhaust stream from a natural gas vehicle having reduced levels of methane. The catalyst disclosed herein may exhibit improvements in sulfur and water resistance.
Claims15
A method for reducing unburned methane in a gas stream resulting from methane combustion in a lean burn natural gas engine, said gas stream comprising sulfur, said method comprising introducing excess air into the combustion chamber of the lean burn natural gas engine, and passing the gas stream resulting from methane combustion in excess air through a methane oxidation catalyst having a support comprising alumina doped with 3 wt % lanthanum in the alumina matrix and an active phase consisting of platinum and palladium, thereby producing an exhaust stream from said natural gas engine having reduced levels of methane relative to the gas stream resulting from the methane combustion in the presence of sulfur,
- wherein the platinum and palladium are present in the methane oxidation catalyst at a weight ratio of Pt:Pd that is between 0.75:1.0 and 5.0:1.0.
Dependencies are inferred from the claim text.