CO Oxidation on CuO and Transition Metal Catalysts: Comparative Study of Varied Silica Structures within CeO2-SiO2 Mixed Oxides

Samadian, Ali; Meshkani, Fereshteh; Mobini, Sajad; Rezaei, Mehran

doi:10.22034/a-see.2025.2053863.1001

CO Oxidation on CuO and Transition Metal Catalysts: Comparative Study of Varied Silica Structures within CeO2-SiO2 Mixed Oxides

Document Type : Original Article

Authors

Ali Samadian ¹

Fereshteh Meshkani ¹

Sajad Mobini ¹

Mehran Rezaei ²

¹ Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran

² School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Tehran, Iran

10.22034/a-see.2025.2053863.1001

Abstract

The CeO₂-M (M: SiO₂, MCM-41, MCM-48, and SBA-15) powders were fabricated by various techniques and were used as support for the Cu-based catalysts in the CO oxidation process. TPR, XRD, and N₂ adsorption-desorption techniques were applied to characterize the specimens that were made. The prepared catalysts possessed high surface areas in a 121_572 m²/g span. The catalytic outcomes revealed that the Cu catalyst supported on the CeO₂-SiO₂ displayed the highest performance. CO conversion increased rapidly to 65% at around 150 °C and slowly reached 100% at around 300 °C. The influence of the different active species (Cu, Co, Mn, and Fe) on the optimum support was investigated, and the findings indicated that the CO conversion was considerably higher over the Co catalyst. It was observed that the activity of the Co/CeO₂-SiO₂specimen rose gradually to 100% at 200 °C. A microporous and mesoporous structure with a narrow pore size distribution was also confirmed. The pretreatment tests also showed an affirmative trace of oxidative pretreatment on the catalytic efficiency. The stability tryout of the CO oxidation over the Co/CeO₂-SiO₂ model under dry and wet feed status during 36 h displayed high durability without any drop in CO conversion.

Graphical Abstract