Based on our previous investigations, it turned out that the Co₃O₄ material is a promising catalyst in the ambient pressure CO₂ methanation. This work aims at understanding the Pt-Cobalt-Oxide surface interaction and its effect on the catalytic performance. The incorporation of Pt nanoparticles into the mesoporous Co₃O₄ (Pt/m-Co₃O₄) and commercial Co₃O₄ (Pt/c-Co₃O₄) improves the catalytic activity of both catalysts by a factor of ∼ 1.4 and ∼ 1.9 respectively at 673 K. The same tendency towards the increased basicity was also observed. Morphology-induced surface basicity was previously shown to play a key role in determining the catalytic activity of free-standing supports. From HR-TEM (-EDX), EXAFS, CO₂-TPD, and CO chemisorption measurements it was established that during the pre-treatment, Co-Pt alloy particles partially covered by the Co_xO_y layer are formed. It has been postulated that this structure transformation generates new basic centres, the amount of which per unit surface area is significantly larger for Pt/c-Co₃O₄ and this in turn is responsible for the higher enhancement effect of the Pt/c-Co₃O₄ catalyst in the CO₂ methanation. This study emphasizes the importance of the surface structure exploration for the dynamic catalytic systems in order to reach maximum activity and selectivity in the CO₂ methanation.

根据我们之前的研究，结果证明 Co ₃ O ₄材料是环境压力 CO ₂甲烷化中很有前途的催化剂。这项工作旨在了解 Pt-Cobalt-Oxide 表面相互作用及其对催化性能的影响。Pt纳米粒子掺入介孔Co ₃ O ₄ (Pt/m-Co ₃ O ₄ )和商业Co ₃ O ₄ (Pt/c-Co ₃ O ₄) 在 673 K 下分别将两种催化剂的催化活性提高了约 1.4 倍和约 1.9 倍。还观察到碱度增加的相同趋势。先前已证明形态诱导的表面碱度在确定独立载体的催化活性方面起着关键作用。从 HR-TEM (-EDX)、EXAFS、CO ₂ -TPD 和 CO 化学吸附测量确定，在预处理期间，形成了部分被 Co _x O _y层覆盖的 Co-Pt 合金颗粒。据推测，这种结构转变会产生新的基本中心，Pt/c-Co ₃ O ₄每单位表面积的数量要大得多这反过来又是 Pt/c-Co ₃ O ₄催化剂在 CO ₂甲烷化中具有更高增强效果的原因。该研究强调了动态催化系统表面结构探索的重要性，以便在 CO ₂甲烷化中达到最大活性和选择性。