Abstract
Effect of Na2O additive in an Al2O3-coated cordierite honeycomb ceramic-supported CuO catalyst on simultaneous SO2 and NO removal activities was studied at 400 °C. Results show that SO2 removal activity increases with increasing sodium loading from 0 to 2.0 wt % but decreases with further increasing sodium loading to 3.0 wt %, while NO removal activity monotonically decreases with increasing sodium loading, from 99 to 65%, due to increased NH3 oxidation activity. Mechanism of the effect of Na2O additive on SO2 removal activity is studied using N2 adsorption, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and X-ray powder diffraction (XRD). Results show that Na2O additive (at sodium loadings of 1.0−2.0 wt %) inhibits the formation of Al−Si−O species and improves the distribution of CuO, which limits pore plugging and increases BET surface area of the catalyst. These behaviors account for the promoting effect of Na2O additive on SO2 removal activity. However, with increasing sodium loadi...
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