Methane oxidation at high pressures and intermediate temperatures was investigated in a laminar flow reactor and in a rapid compression machine (RCM). The flow-reactor experiments were conducted at 700-900 K and 100 bar for fuel-air equivalence ratios (Φ) ranging from 0.06 to 19.7, all highly diluted in nitrogen. It was found that under the investigated conditions, the onset temperature for methane oxidation ranged from 723 K under reducing conditions to 750 K under stoichiometric and oxidizing conditions. The RCM experiments were carried out at pressures of 15-80 bar and temperatures of 800-1250 K under stoichiometric and fuel-lean (Φ=0.5) conditions. Ignition delays, in the range of 1-100 ms, decreased monotonically with increasing pressure and temperature.

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