Journal
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
Volume 11, Issue 2, Pages -Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11783-017-0908-8
Keywords
Ti-modified sepiolite; Supported Mn-Cu mixed oxide; Low-temperature reducibility; Strong metal-support interaction; CO oxidation
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Funding
- National Natural Science Foundation of China [21277008, 20777005]
- Natural Science Foundation of Beijing [8082008]
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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, N-2 adsorption-desorption, H-2-TPR, O-2-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 x 10(-3) mmol.g(-1).s(-1) and the lowest T-50% and T-100% of 56 degrees C and 86 degrees C, respectively. Moreover, the 30Mn5Cu/Ti-Sep possessed the best low-temperature reducibility, the lowest O-2 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. (C) Higher Education Press and Springer-Verlag Berlin Heidelberg 2017
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