Abstract
Developing simple and highly efficient technologies for CO2 conversion to chemical fuels is always of great interest. In this work, we report a new and simple method of CO2 conversion into methane in water with an in situ synthesized Ni nanoparticle catalyst, in which the water is used as a hydrogen source and earth-abundant metals (Zn or Fe) are used as re-generable reductants. An excellent 98% yield of methane from either CO2 or HCO3− was obtained at 300 °C, and the in situ formed Ni nanoparticle catalyst exhibits not only extraordinary catalytic activity but also stability. Mechanistic studies suggest that the formation of methane from HCO3− or CO2 follows the pathway of HCO3− → CO2 → HCOOH → CH4. This work demonstrates a simple approach for highly efficient conversion of CO2 to methane with earth-abundant materials.
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