Partial homogeneous oxidation of methane (CH 4 ) within stationary engines may be one concept for conversion of available energy to alternatively mechanical energy, heat, and additional useful chemicals like syngas (CO/H 2 ), formaldehyde (CH 2 O), methanol (CH 3 OH) or hydrocarbons (e.g. C 2 H 4 ). The present study investigates the formation reactions of chemicals experimentally and theoretically. Methane oxidation is studied under fuel-rich conditions ( = 17.50-22.25) at high pressures (6 bar) and high temperatures ( max = 1030 K) for long residence times in a tubular reactor. The gas composition is determined experimentally by time-of-flight mass spectrometry for different reactor temperatures. Through variation of reactor temperature an overview of the maximum mole fractions of target chemicals, the temperature of observed reaction onset, and the optimal temperature to increase target yields can be determined. The experimental results are compared to kinetic simulations of the methane conversion using literature mechanisms to assess how well the data are reproduced for these uncommon reaction conditions. The potential of activating the conversion reactions with ethane (C 2 H 6 ) and propene (C 3 H 6 ) as additives is investigated. Methanol is chosen as one target compound. Its yield is increased by both additives. In addition, propene as additive reduces the temperature of reaction onset in the experiments and in the simulation. CH 2 O and C 2 H 4 can be identified as other useful chemicals produced in the experiments and the influence of the additives on the yields is discussed.
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