The efficiency of CO₂ methanation was estimated through gas chromatography in the presence of Co–Fe catalysts. Scanning electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, and Mössbauer spectroscopy were applied for ex-situ analysis of the catalysts after their test in the methanation reaction. Thermal programmed desorption mass spectroscopy experiments were performed to identify gaseous species adsorbed at the catalyst surface. Based on the experimental results, surface reaction model of CO₂ methanation on Co–Fe catalysts was proposed to specify active ensemble of metallic atoms at the catalyst surface, orientation of adsorbed CO₂ molecule on the ensemble and detailed reaction mechanism of CO₂→CH₄ conversion. The reaction step when OH group in the FeOOH complex recombined with the H atom adsorbed at the active ensemble to form H₂O molecule was considered as the rate-limiting step.

在 Co-Fe 催化剂存在下，通过气相色谱法评估CO ₂甲烷化的效率。在甲烷化反应测试后，应用扫描电子显微镜、X 射线粉末衍射、X 射线光电子能谱和穆斯堡尔光谱对催化剂进行异位分析。进行热程序解吸质谱实验以鉴定吸附在催化剂表面的气态物质。基于实验结果，提出了 Co-Fe 催化剂上CO ₂甲烷化的表面反应模型，以指定催化剂表面金属原子的活性系综、吸附的 CO ₂分子在系综上的取向以及 CO 的详细反应机理。₂ →CH ₄转换。FeOOH配合物中的OH基团与活性系综上吸附的H原子复合形成H ₂ O分子的反应步骤被认为是限速步骤。