Study with Micro-reactor on Deactivation of Pd Methane Oxidation Catalyst for Marine Lean Burn Gas Engines

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<p>  Marine lean burn gas engines use natural gas as a fuel and contribute to reducing both NOx and CO2 emissions. On the other hand, the slipped methane which is the unburned methane emitted from the marine lean burn gas engines may have an impact on global warming. Palladium (Pd) catalysts for CH4 oxidation are considered to be one of the most effective means to suppress the slipped methane from lean burn gas engines because they are still active in the lower exhaust gas temperature. However, recent studies have shown that water vapor (H2O) inhibits CH4 oxidation on theses catalysts and deactivates their oxidation capacity. When using Pd catalysts for an exhaust gas aftertreatment in order to reduce the volume of slipped methane from lean burn gas engines, we need to overcome the issue of these catalysts deactivation at the time of higher H2O concentration. This paper explored conditions necessary for sound operations of marine lean burn gas engines by investing possible impacts of the temperature and composition of simulated exhaust gas and characterization of Pd catalysts on their CH4 oxidation performance. Our case study also producedan appropriate geometric size as a design parameter for a CH4 converter to be installed on a marine lean burn gas engine to reduce the slipped methane.</p>

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