Enhancing the Activity and Stability of CuO/OMS-2 Catalyst for CO Oxidation at Low Temperature by Modification with Metal Oxides

Abstract

In this study, mixed oxides of Mn-Cu and Fe-Cu on OMS-2 support having an octahedral structure were synthesized by the refluxing and impregnation methods. The characteristics of the materials were analyzed by XRD, FTIR, SEM, EDX, and H2-TPR. In the CO oxidation test, CuFeOx/OMS-2 had slightly higher catalytic activity but is significantly more stable than CuMnOx/OMS-2 and CuO/OMS-2. Due to its lower reduction temperature in H2-TPR analysis, the Mars-Van-Krevelen mechanism for CuFeOx/OMS-2 (Cu2+–O–Fe3+ ↔ Cu+–□–Fe2+) could take place more energetically than CuO/OMS-2 and CuMnOx/OMS-2 (Cu2+–O2−–Mn4+ ↔ Cu+–□–Mn3+). In addition, the interaction between Fe and Cu in the catalyst could improve the durability of the surface oxides structure in comparison with that between Mn and Cu. With the high specific rate and TOF of 28.6 mmol/h.g and 0.508, respectively, CuFeOx/OMS-2 has a great potential as an effective catalyst for low-temperature oxidation application in CO and possible VOCs removal.

Research Progress of a Composite Metal Oxide Catalyst for VOC Degradation

“…The low-temperature activity of the catalysts has been a hot research topic in recent years, Nguyen et al 103 synthesized Mn−Cu and Fe−Cu mixed oxides with octahedral structure on the OMS-2 (octahedral molecular sieve) carrier by the reflow impregnation method. The interaction of Fe and Cu can improve the durability of the oxide structure on the catalyst surface and thus improve the catalytic activity of VOC oxidation at low temperature.…”

A Study on the Effect of Support on the Catalytic Activity of OMS-2 for Oxidation of Toluene in Gas Phase

“…The refluxing method was used to synthesize the OMS-2 catalyst in this study [22][23][24]. The solid obtained after refluxing a mixture of KMnO4, MnSO4, and HNO3 for 2 h was filtered, washed, then dried, heated, ground, and screened.…”