由于 CO2 的过量排放而引发的温室效应已成为当今世界面临的重要环境问题,将 CO2还原转化为高附加值化学品和燃料是解决这一问题的有效途径.其步骤包括吸收入射光子;电子-空穴对的产生、分离和转移;CO2分子在表面上的吸附、活化和转化.基于MgO可增强CO2在表面的吸附进而促进后续的光催化还原,介绍了光催化还原 CO2 的机理以及 MgO 在 CO2 还原与吸附等方面的应用研究.MgO 表面化学吸附的 CO2 分子变得不稳定,其反应活性高于线性 CO2 分子,因此显著提高CO2的转化效率,可见其在CO2吸附与转化等方面具有良好的发展前景.
Mechanism of Photocatalytic Reduction of CO2 and Application of MgO in Adsorption and Conversion
The greenhouse effect caused by the excessive emission of CO2 has become one of the major environmental problems today,reducing CO2 into high value-added chemicals and fuels is an effective way to solve this problem.The steps of photocatalysis include light absorption,separation and transfer of electron-hole pairs,adsorption,activation and transformation of CO2 molecules on the surface.Based on the fact that MgO can enhance the adsorption of CO2 and promote the subsequent photocatalytic reduction,the mechanism of photocatalytic reduction of CO2 and the application of MgO in CO2 reduction and adsorption were introduced.The CO2 molecule chemically adsorbed on the surface of MgO becomes unstable,the reactivity of which is higher than that of linear CO2 molecule.Therefore,the conversion efficiency of CO2 can be significantly improved,showing that MgO has good development prospect in CO2 adsorption and conversion.
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