| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Research Abstract |
A solid electrolyte oxidation reactor has been applied to the oxidative coupling reaction of methane. Findings from this investigation are as follows:
1.The oxygen ion passing through the solid electrolyte was more reactive over Ag catalyst electrode than the adsorbed oxygen from the gas phase. Over Ag electrode, C_2 compounds were formed at the rate of about ten times larger in the transport system than in the premixture system.
2.The fraction of oxygen utilized to the oxidative coupling was rather small and strongly dependent on the electrode material.
3.Over LaCoO_3 electrode, complete oxidation predominantly proceeded with little amount of unreacted wxygen. These results suggested that the oxygen active species participating the oxidative coupling reaction are different from the oxygen ions, O^<2->, diffusing through the solid electrolyte.
4.Many of the perovskite-type oxides made from such an alkaline earth metal as Ca, Sr, Ba and a transition metal, Ti, Zr, or Ce had high catalytic activity in oxidative coupling reaction. These complex oxides were very stable whereas the single oxide of alkaline earth metal changed to carbonate in this reaction.
5. The A-site ion played an important role in this reaction in contrary to the previous finding that the B-site ion did.
6.A clear correlation was found between the catalytic activity per unit surface area of oxide and the displacement of the distance between an oxygen ion and a metal ion.
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