Abstract
Selective oxidation of methane in CH 4–O 2–NO 2 was examined using MoO 3 catalyst at atmospheric pressure. The selective oxidation was enhanced with addition of NO 2 to the reaction system of CH 4 and O 2, in analogy with the gas-phase reaction. The initiation reaction was assured to take place between CH 4 and NO 2. The presence of MoO 3 catalyst increased CH 2O selectivity and decreased CH 3OH selectivity, compared with those for the gas-phase reaction in CH 4–O 2–NO 2. Based on variations in reaction of selectivities at several reaction conditions, it could be explained/concluded that formaldehyde was a main product on the MoO 3 catalyst and methanol was formed through gas-phase reactions.
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