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CuO, CuMnOx and MnOx catalysts were anchored on the manganese oxide support with the structure of octahedral molecular sieves (OMS-2), which were synthesized using MnSO4 and KMnO4 as precursors by refluxing under acidic conditions or impregnation. | Vietnam Journal of Science and Technology 56 (6) (2018) 741-750 DOI: 10.15625/2525-2518/56/6/13067 BINARY COPPER AND MANGANESE OXIDE NANOPARTICLES SUPPORTED OMS-2 FOR ENHANCING ACTIVITY AND STABILITY TOWARD CO-OXIDATION REACTION AT LOW TEMPERATURE Nguyen Trung Thanh, Nguyen Thi Quynh Anh* Deparment of Environmental Engineering, An Giang University, 18 Ung Van Khiem, Long Xuyen City, An Giang Province * Email: ntqanh@agu.edu.vn Received: 4 September 2018, Accepted for publication: 5 December 2018 ABSTRACT CuO, CuMnOx and MnOx catalysts were anchored on the manganese oxide support with the structure of octahedral molecular sieves (OMS-2), which were synthesized using MnSO4 and KMnO4 as precursors by refluxing under acidic conditions or impregnation. The catalysts were then tested for CO oxidation. These catalysts and OMS-2 support were characterized by X-ray diffraction, FTIR, SEM, and H2-TPR. For CO oxidation reaction, CuO and CuMnOx catalysts showed extremely higher activities than that of MnOx catalyst and OMS-2 support. The 100 % conversion of CO (T100) for the CuO and CuMnOx catalysts were observed at 55 oC and 65 oC, respectively. Due to the presence of Cu2+– O2− – Mn4+ ↔ Cu+–□–Mn3+ + O2 the redox couple in the structure of these solid catalyst. Additionally, the CuMnOx catalyst showed higher activity (~ 1.74 folds) and exhibited better stability than CuO catalyst in CO oxidation, due to the advanced functionallity of binary oxide structure of CuMnOx catalyst. As known, CO oxidation may follow the Mars-van-Krevelen mechanism with Cu2+– O2− – Mn4+ ↔ Cu+–□–Mn3+ + O2 redox couple. This study shows the high application potential of CuMnOx/OMS-2 material in treatment of CO. Keywords: binary oxide catalyst structure; manganese oxide octahedral molecular sieves; low temperature CO oxidation, advanced CuO/OMS-2 catalyst, Mars-van-Krevelen mechanism. Classification numbers: 2.4.2, 2.10.1, 3.4.5. 1. INTRODUCTION The catalyst for CO oxidation has wide applications in .
