MAHLE Powertrain

MAHLE Powertrain proposes an aftertreatment package to minimize methane emissions from natural gas-fired lean and ultra-lean burn engines. The package features a methane oxidation catalyst with a novel hydrothermally stable catalyst formulation that significantly increases methane conversion efficiencies under low temperature exhaust conditions. The methane source addressed is methane that “slips” through the engine, unconverted to other species during combustion. The burden falls on the emissions control system to oxidize methane slip; however, in lean and ultra-lean burn engines, the aftertreatment system must perform this operation at low exhaust temperatures. Methane oxidation catalysts (MOCs) have historically required relatively high temperatures to ensure acceptable methane conversion efficiencies. The proposed concept will incorporate a novel MOC formulation that demonstrates good hydrothermal stability and high conversion efficiencies under low temperature conditions consistent with ultra-lean burn engine exhaust. The MOC is coupled with a selective catalytic reduction approach to significantly reduce NOx emissions as well.

REMEDY addresses methane emissions from domestic oil, gas, and coal value chains, accounting for 78% of U.S. primary energy.