Enhancing the Low-Temperature CO Oxidation over CuO-Based α-MnO Nanowire Catalysts.

A series of CuO-based catalysts supported on the α-MnO nanowire were facilely synthesized and employed as the CO oxidation catalysts. The achieved catalysts were systematically characterized by XRD, SEM, EDS-mapping, XPS and H-TPR. The catalytic performances toward CO oxidation had been carefully evaluated over these CuO-based catalysts. The effects of different loading methods, calcination temperatures and CuO loading on the low temperature catalytic activity of the catalyst were investigated and compared with the traditional commercial MnO catalyst with a block structure. It was found that the slenderness ratio of a CuO/α-MnO nanowire catalyst decreases with the increase in CuO loading capacity. The results showed that when CuO loading was 3 wt%, calcination temperature was 200 °C and the catalyst that was supported by the deposition precipitation method had the highest catalytic activity. Besides, the α-MnO nanowire-supported catalysts with excellent redox properties displayed much better catalytic performances than the commercial MnO-supported catalyst. In conclusion, the CuO-based catalysts that are supported by α-MnO nanowires are considered as a series of promising CO oxidation catalysts.