Thermochemical Reduction of Carbon Dioxide with Alkali Metal Hydrides, Producing Methane and Hydrogen Fuels at Moderate Temperatures

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• 作者：Bao-Xia Dong ; Long-Zheng Wang ; Liang Song ; Juan Zhao ; Yun-Lei Teng
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：August 18, 2016
• 年：2016
• 卷：30
• 期：8
• 页码：6620-6625
• 全文大小：363K
• 年卷期：0
• ISSN：1520-5029

文摘

The use of CO₂ for the production of fuels has attracted much attention because CO₂ can be considered a cheap, nontoxic, and abundant C1 feedstock. In this study, we demonstrated for the first time that CO₂ can be effectively reduced by alkali metal hydrides (LiH or NaH) to produce CH₄ and H₂ fuels concurrently by virtue of heat treatment at moderate temperatures. The yield and mole percent of methane in the gas products for both reaction systems depended upon the reaction temperature and time, and optimal performance was obtained at approximately 450 °C within 48 h. The analysis of the mechanism indicated that amorphous carbon, as an intermediate, plays an important role in the process of CO₂-to-CH₄ conversion. Alkali metal hydride–CO₂ systems are promising reaction systems for the storage and in situ preparation of H₂–CH₄ mixture fuels.