DeNO x performance enhancement of Cu-based oxides via employing a TiO 2 phase to modify LDH precursors.

CuAl-LDO, CuAl-LDO/TiO 2 and CuAl-LDO/TiO 2 NTs catalysts were obtained from TiO 2 modified LDHs precursor which were prepared by in situ assembly method. Then catalysts were evaluated in the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR), and the results showed that the CuAl-LDO/TiO 2 NTs catalyst exhibited preferable deNO x performance (more than 80% NO x conversion and higher than 90% N 2 selectivity at a temperature range of 210-330 °C) as well as good SO 2 resistance. With the aid of series of characterizations such as XRD, N 2 adsorption/desorption, XPS, NH 3 -TPD, H 2 -TPR, and in situ DRIFTS, it could be concluded that, doping TiO 2 NTs afforded the catalyst larger specific surface area, more abundant surface chemisorption oxygen species and more excellent redox performance. Meanwhile, In situ DRIFTS evidenced that CuAl-LDO/TiO 2 NTs catalyst has a strong adsorption capacity for the reaction gas, which is more conducive to the progress of the SCR reaction.