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Excellent performance of Cu-Mn/Ti-sepiolite catalysts for low-temperature CO oxidation |
Yong Song1,Lisha Liu1,Zhidan Fu1,Qing Ye1( ),Shuiyuan Cheng1,Tianfang Kang1,Hongxing Dai2() |
1. Key Laboratory of Beijing on Regional Air Pollution Control, Department of Environmental Science, Beijing University of Technology, Beijing 100124, China
2. Beijing Key Laboratory for Green Catalysis and Separation, Key Laboratory of Beijing on Regional Air Pollution Control, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract Sepiolite is clay mineral with a 2:1 layered structure. Ti-pillars have an impact on physicochemical property of the sample. 30Mn5Cu/Ti-Sep shows excellent catalytic activity for the oxidation of CO. The interaction, reducibility, and oxygen mobility govern the activity. The Ti-modified sepiolite (Ti-Sep)-supported Mn-Cu mixed oxide (yMn5Cu/Ti-Sep) catalysts were synthesized using the co-precipitation method. The materials were characterized by the X-ray diffraction scanning electron microscope, N2 adsorption-desorption, H2-TPR, O2-TPD, and XPS techniques, and their catalytic activities for CO oxidation were evaluated. It was found that the catalytic activities of yMn5Cu/Ti-Sep were higher than those of 5Cu/Ti-Sep and 30Mn/Ti-Sep, and the Mn/Cu molar ratio had a distinct influence on catalytic activity of the sample. Among the yMn5Cu/Ti-Sep samples, the 30Mn5Cu/Ti-Sep catalyst showed the best activity (which also outperformed the 30Mn5Cu/Sep catalyst), giving the highest reaction rate of 0.875 × 10−3 mmol·g−1·s−1 and the lowest T50% and T100% of 56°C and 86°C, respectively. Moreover, the 30Mn5Cu/Ti-Sep possessed the best low-temperature reducibility, the lowest O2 desorption temperature, and the highest surface Mn3+/Mn4+ atomic ratio. It is concluded that factors, such as the strong interaction between the copper or manganese oxides and the Ti-Sep support, good low-temperature reducibility, and good mobility of chemisorbed oxygen species, were responsible for the excellent catalytic activity of 30Mn5Cu/Ti-Sep.
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| Keywords
Ti-modified sepiolite
Supported Mn-Cu mixed oxide
Low-temperature reducibility
Strong metal-support interaction
CO oxidation
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Corresponding Author(s):
Qing Ye,Hongxing Dai
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Issue Date: 17 March 2017
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