| 摘要 |
PURPOSE:To efficiently convert carbon dioxide into methane at a relatively low temp. by passing carbon dioxide and hydrogen through a ferrite to deposit carbon on the ferrite surface and heating the ferrite in hydrogen. CONSTITUTION:A gas contg. carbon dioxide is supplied to a carbon dioxide separator 2 and passed through a separation. membrane, and the permeated carbon dioxide is sent to a moisture remover 3 to remove the moisture in the carbon dioxide. The carbon dioxide is then introduced through a switching valve 4 into a first reaction furnace 5 contg. a ferrite lump 6 kept at 300-400 deg.C, and hydrogen is supplied to the first reaction furnace 5 from a pipe 17. The carbon dioxide is reduced on the surface of the ferrite lump 6, and carbon is deposited. The gas leaving the first reaction furnace 5 is introduced into a hydrogen separator 8, and the hydrogen permeated through an palladium membrane is recycled. A ferrite lump 11 coated with carbon is introduced into a second reaction furnace 10 kept at >=about 600 deg.C. Hydrogen is supplied to the second reaction furnace 10 from the pipe 17, and the carbon deposited on the ferrite lump 11 is allowed to react with the hydrogen and converted into methane. |
