Excellent performance of Cu-Mn/Ti-sepiolite catalysts for low-temperature CO oxidation

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 T_50% and T_100% 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.

Graphical abstract

Keywords

Ti-modified sepiolite / Supported Mn-Cu mixed oxide / Low-temperature reducibility / Strong metal-support interaction / CO oxidation

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 21277008 and 20777005) and Natural Science Foundation of Beijing (No. 8082008).

Electronic Supplementary material

Supplementary material is available in the online version of this article at http://dx.doi.org/10.1007/s11783-017-0908-8 and is accessible for authorized users.

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