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By Edited by Gerald Ondrey |

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Making CO from CO2Professor Rhosuke Suzuki at Hokkaido University (Sapporo City, Japan; www.eng.hokudai.ac.jp) has developed a molten-salt electrolysis process that can produce CO from high temperature CO2 present in the fluegas of industrial furnaces. The process uses a molten salt containing CaCl2-CaO melt as a media and a solid-state electrolyte, containing 8 mol% YZrO2 in Y2O3, as the anode. Operating at temperatures of 800 to 1,000°C, the electrolyzer decomposes CO2 into CO2 with a conversion efficiency of 88.2% (at 1,000°C). The CO forms by the decomposition of carbonate ions, which coexist with the CaO as CO2 is bubbled into the melt. Suzuki believes the process provides a way to utilize the CO2 generated from industries having hot fluegases, such as steel and cement production, non-ferrous metal smelting and waste incineration.
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