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.