Journal
CHEMICAL ENGINEERING JOURNAL
Volume 128, Issue 1, Pages 47-50Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2006.10.002
Keywords
electrochemical reduction of high pressure CO2; cold methanol; cesium hydroxide supporting salt; Cu electrode
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The electrochemical reduction of high pressure CO2 at a Cu electrode in cold methanol was investigated with cesium hydroxide supporting salt. A divided H-type glass cell, which was placed in a high-pressure stainless steel vessel, was employed. The main products from CO, by the electrochemical reduction were carbon monoxide, formic acid, methane and ethylene. The maximum current efficiency of CO was of 84% at -3.5 V. In the potential region more negative than -3.0 V, the efficiency of hydrogen formation, being a competitive reaction against CO, reduction, was depressed to less than 2%. The partial current density ratio of CO2 reduction and hydrogen evolution, i(CO2)/i(H-2), was more than 42 at potentials more negative than -3.0V This reserch can contribute to the large-scale manufacturing of useful material from readily available and inexpensive raw materials, CO2-saturated methanol from industrial absorbers (the Rectisol process). (c) 2006 Elsevier B.V. All rights reserved.
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