Porous (0.6–30 nm) and non-porous spherical silica nanoparticles are synthesized. These silicas with different morphologies are decorated with cobalt (2.9 wt%) using Co(NO₃)₂·6H₂O as precursor. Co-SiO₂ particles are studied by N₂ sorption, TEM, XRD, XPS, FTIR and TPR-H₂ methods. Specific surface area (SSA) of the prepared materials is 10–1200 m²/g. The main crystalline phase is identified as Co₃O₄. The activity of Co-SiO₂ composites in the CO oxidation and preferential oxidation of CO (PROX) in a H₂-rich gas mixture improves with increasing atomic ratios of Co/Si and Co³⁺/Co²⁺ on the silica surface. Catalysts with the large mesopores containing mainly Co²⁺ are the least active. Co-SiO₂ composites based on synthetic opal grown by sedimentation of non-porous silica particles with the lowest SSA demonstrate the highest catalytic activity. The CO conversion reaches 100% at 150 °C in the absence of hydrogen, while in PROX the 90% conversion of CO is achieved at 170 °C. The large Co₃O₄ aggregates between non-porous spherical silica particles of opal are the most active and stable during CO-PROX reaction. The lower interaction of Co₃O₄ nanoparticles with this support promotes the stabilization of the oxidized state Co³⁺ and provides a higher yield of CO₂ in CO-PROX reaction.

合成了多孔（0.6-30 nm）和无孔球形二氧化硅纳米粒子。使用Co(NO ₃ ) ₂ ·6H ₂ O作为前体，这些具有不同形态的二氧化硅用钴(2.9wt％)装饰。通过N ₂吸附、TEM、XRD、XPS、FTIR和TPR-H ₂方法研究Co-SiO ₂颗粒。所制备材料的比表面积 (SSA) 为 10–1200 m ² /g。主晶相被确定为 Co ₃ O ₄。Co-SiO ₂复合材料在H _{2 中}CO氧化和CO优先氧化(PROX)的活性富气体混合物随着二氧化硅表面上Co/Si 和 Co ³⁺ /Co ²⁺原子比的增加而改善。具有主要包含 Co ²⁺的大中孔的催化剂活性最低。基于合成蛋白石的Co-SiO ₂复合材料通过无孔二氧化硅颗粒的沉降生长，SSA 最低，表现出最高的催化活性。在没有氢气的情况下，CO 转化率在 150 °C 时达到 100%，而在 PROX 中，CO 转化率在 170 °C 时达到 90%。蛋白石的无孔球形二氧化硅颗粒之间的大 Co ₃ O ₄聚集体在 CO-PROX 反应过程中是最活跃和最稳定的。Co ₃ O ₄的低相互作用具有这种支持的纳米颗粒促进了氧化态 Co ³⁺的稳定，并在 CO-PROX 反应中提供了更高的 CO ₂产率。