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

Bao-Xia Dong,*Long-Zheng Wang, Liang Song, Juan Zhao, and Yun-Lei Teng*

School of Chemistry and Chemical Engineering, Yangzhou University

Abstract: The use of CO₂for the production of fuels has attracted much attention because CO₂can be considered a cheap, nontoxic, and abundant C1 feedstock. In this study, we demonstrated for thefirst time that CO₂can be effectively reduced by alkali metal hydrides (LiH or NaH) to produce CH₄and H₂fuels 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-CH₄conversion. Alkali metal hydride−CO₂systems are promising reaction systems for the storage and in situ preparation of H₂−CH₄mixture fuels.

Energyfuels, 2016, 30,6620–6625

文章链接：http://pubs.acs.org/doi/abs/10.1021/acs.energyfuels.6b01353