Fe@SiO₂ core–shell model catalysts were investigated for the conversion of CO₂ and H₂ into CH₄, CO and H₂O. For evaluation of the effect of core size on the catalytic activity, samples with Fe particle sizes of 4, 6 and 8 nm were prepared. Fresh and spent catalysts were thoroughly characterized by X-ray diffraction, ⁵⁷Fe Mössbauer spectroscopy, transmission electron microscopy, temperature programmed hydrogenation and X-ray photoelectron spectroscopy. As a result, the yield of the major product CO as well as CH₄ was increased with Fe core size. Additionally, growing Fe cores led to stronger carburization and higher amount of reactive carbide entities, which drive the CH₄ formation. Finally, formation of inactive bulk carbon deposition is strongly suppressed for the core–shell catalysts in comparison to bulk iron oxide catalysts used for CO₂ hydrogenation.

的Fe @的SiO ₂的核-壳模型的催化剂进行了调查CO的转化₂和H ₂变成CH ₄，CO和H ₂ O.对于芯尺寸对催化活性的影响的评估，具有4的Fe颗粒尺寸的样品制备了6和8nm。通过X射线衍射，⁵⁷ FeMössbauer光谱，透射电子显微镜，程序升温加氢和X射线光电子能谱对新鲜和废催化剂进行了全面表征。结果，主要产品CO和CH ₄的收率随着铁芯尺寸的增加而增加。此外，不断增长的铁芯导致更强的渗碳和更多的反应性碳化物实体，从而推动了CH _4的形成。最后，与用于CO ₂加氢的块状氧化铁催化剂相比，核-壳催化剂大大抑制了无活性块状碳沉积的形成。