Preparation of highly efficient Fe-based catalysts is a reliable and achievable goal for catalyzing CO₂ hydrogenation. Herein, ethylene diamine as a benign modifier well regulates the surface properties of carbon support, achieving a good dispersion of active small-size iron carbide sites. With the further incorporation of alkaline K promoter, heavy hydrocarbon selectivity (C₅₊) is increased from 14.8% to 39.8%. Combining several catalyst characterization (XRD, CO₂-TPD, H₂-TPR, TEM, and XPS) and reaction data, discloses that good dispersion, enhanced reduction/carburization behavior, and small-size carbides formation are essential for improving CO₂ performance. Simultaneous doping of nitrogen atoms and alkali metal provides a promising means for CO₂ fixation and rational design of functionalized metal-supported carbon catalysts.

制备高效的铁基催化剂是催化CO ₂加氢的可靠且可实现的目标。在此，乙二胺作为良性改性剂很好地调节了碳载体的表面性能，实现了活性小尺寸碳化铁位点的良好分散。随着碱K助催化剂的进一步掺入，重烃选择性（C ₅₊）从14.8％增加到39.8％。结合几种催化剂表征（XRD，CO ₂ -TPD，H ₂ -TPR，TEM和XPS）和反应数据，发现良好的分散性，增强的还原/碳化行为以及小尺寸碳化物的形成对于改善CO ₂是必不可少的性能。氮原子和碱金属的同时掺杂为CO ₂固定和功能化金属负载碳催化剂的合理设计提供了一种有希望的手段。