Abstract
To eliminate nitrogen oxides (NO(x)), a series of highly ordered mesoporous WO(3)(χ)-CeO(2) nanomaterials (χ represents the mole ratio of W/Ce) were synthesized by using KIT-6 as a hard template, which was used for selective catalytic reduction (SCR) to remove NO(x) with NH(3) at low temperatures. Moreover, the nanomaterials were characterized by TEM, XRD, Raman, XPS, BET, H(2)-TPR, NH(3)-TPD and in situ DRIFTS. It can be found that all of the prepared mesoporous WO(3)(χ)-CeO(2) (χ = 0, 0.5, 0.75, 1 and 1.25) showed highly ordered mesoporous channels. Furthermore, mesoporous WO(3)(1)-CeO(2) exhibited the best removal efficiency of NO(x), and its NO(x) conversion ratio could reach 100% from 225 ° C to 350 ° C with a gas hourly space velocity of 30 000 h(-1), which was due to higher Ce(3+) concentrations, abundant active surface oxygen species and Lewis acid sites based on XPS, H(2)-TPR, NH(3)-TPD and in situ DRIFTS. In addition, several key performance parameters of mesoporous WO(3)(1)-CeO(2), such as superior water resistance, better alkali metal resistance, higher thermal stability and N(2) selectivity, were systematically studied, indicating that the synthesized mesoporous WO(3)(1)-CeO(2) has great potential for industrial applications.