TiO2-carbon nanotubes composite supported MnOx-CuO catalyst for low-temperature NH3-SCR of NO: Investigation of SO2 and H2O tolerance.

[Display omitted] • Mn-based SCR catalysts with different CuO content were analyzed and tested over TiO 2 /CNTs composite support for NO conversion. • Effect of CuO and CNTs addition to Mn/Ti catalyst on H 2 O/SO 2 resistance was investigated. • Test results depicted that addition of 5 wt% CuO was sufficient to achieve better NO conversion in the temperature regime of 150–350 °C. • Remarkable low temperature SCR activity was achieved with the addition of CuO to Mn/Ti-C catalyst. A series of titania-carbon nanotubes (TiO 2 -CNTs) supported MnOx-CuO catalysts were prepared and investigated for NH 3 -SCR of NO at low temperature. It was observed that the addition of Cu and/or CNTs to Mn/TiO 2 has a beneficial effect in improving the activity of the catalyst. In addition, the effect of Cu loading was also studied and found that the catalyst with 5 wt% Cu (Mn-Cu 5 /Ti-CNTs) exhibited the best NH 3 -SCR performance. Remarkably, the Mn-Cu 5 /Ti-CNTs showed excellent resistance to SO 2 /H 2 O in comparison to the Mn/TiO 2 catalyst. The addition of CNTs has increased the specific surface area, total pore volume, and reduced the average pore size of the catalyst. Meanwhile, the Cu loading has enhanced the Mn4+ species and chemisorbed oxygen species on the surface of the catalyst. Besides, the incorporation of both Cu and CNTs have decreased the catalyst reduction temperature and increased the amount and strength of acidic sites on the catalyst. All these factors contributed to the superior NH 3 -SCR activity and SO 2 /H 2 O resistance of the catalyst. [ABSTRACT FROM AUTHOR]