Electrochemical Hydrogenation of CFC-13 Using Metal-Supported Gas Diffusion Electrodes
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- 作者：Noriyuki Sonoyama and Tadayoshi Sakata
- 刊名：Environmental Science & Technology
- 出版年：1998
- 出版时间：December 15, 1998
- 年：1998
- 卷：32
- 期：24
- 页码：4005 - 4009
- 全文大小：133K
- 年卷期：v.32,no.24(December 15, 1998)
- ISSN：1520-5851
文摘
Chlorofluorocarbons(CFCs) are known to cause thedepletion of the ozone layer at the stratosphere. A largeamount of CFCs still in use should be collected andretreated to harmless compounds to the environment.Electrochemical hydrogenation of CFC-13 (CClF3), which isthe most stable of the C1 chlorofluorocarbons, wasattempted with 13 kinds of metal-supported porous carbongas diffusion electrodes (GDEs). In the case of theelectrolysis at a Cu-supported GDE, both dechlorinationand defluorination of CFC-13 proceeded, and methane wasproduced. With a Ag-supported GDE, dechlorinationproceeded selectively, and HFC-23 (CHF3) was produced.The faradaic efficiency for hydrogenation of CFC-13 dependson the current density, the pressure of CFC-13, thecomposition of the electrolyte solution, and the potentialimposed on the GDE. If these factors are optimized, thefaradaic efficiency for hydrogenation of CFC-13 wasimproved up to 77.7%.