Apparatus and method for desulfation of a catalyst used in a lean burn methane source fueled combustion system

An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising:

• an exhaust line adapted for receipt of exhaust from the methane sourced fuel combustion device;
• a catalyst positioned for contact with exhaust traveling in the exhaust line;
• a methane level sensor downstream of the catalyst;
• a control unit;
• CO supplementation means, in communication with the control unit, for supplementation of CO content in the exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst, so as to desulfate the catalyst, and
• wherein the catalyst is a Pd-based catalyst.

An apparatus for catalytic treatment of exhaust from a lean burn, methane sourced fuel combustion device, comprising:

• an exhaust line adapted for receipt of exhaust from the combustion device;
• a catalyst positioned for contact with exhaust traveling in the exhaust line;
• a methane level sensor downstream of the catalyst;
• a control unit;
• a CO supplementation apparatus in communication with the control unit and adapted to supplement CO content in the exhaust reaching the catalyst, while avoiding an overall rich exhaust atmosphere at the catalyst, so as to desulfate the catalyst, and
• wherein the CO supplementation apparatus operates such that the lean state of the exhaust reaching the catalyst during supplementation is retained at or greater than lambda 1.1.