Methane is converted to formaldehyde in the yield of 90% when oxic-ized by oxygen containning ozone on the solid catalysts.This process is known as Hibernia Process and has been given the best result among other methods proposed in literatures hitherto.
The authors made some experiments on this process but could only obtain a trace of formaldehyde.Such negative results was similarly reported by P.Luetic's literature.
By analysing our experimental results on the catalytic decomposition of formaldehyde in a gas phase, we showed that under the reacting condition specified in Hibernia Process the decomposition of formaldehyde is largely accelerated and the reason for the meagre yield of formaldehyde is clearly attributed to this second reaction.
Furthermore, authors investigated how the oxidation of methane by oxygen would proceed in the silent discharge tube.
By changing reacting conditions we succeeded to clarify the effect of reaction factors on formaldehyde yield which are, for example, feed gas composition, feed gas velocity, voltage, materials of electrode and reaction temperature.
Especially, concerning with the electrode materials, copper electrode was superior to the glass one, and the former gave the remarkably higher yield of 12 times of form-aldehyde obtained with the latter.
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