Studies on the adsorption performance of K2CO3/γ-Al2O3 to SO2

The dispersion of K2CO3 on γ-Al2O3 and the adsorption performance of K2CO3/γ-Al2O3 to SO2 are investigated. The results show that K2CO3 can disperse onto the surface of γ-Al2O3 as a monolayer and the dispersion threshold is 0.31 [m (K2CO3)/m (γ-Al2O3), m/g], which is close to the theoretical value calculated by assuming a bidentate vertical dispersion model of CO2 on the γ-Al2O3 surface. The SO2 adsorption-capacity on K2CO3/γ-Al2O3 sample increases with the K2CO3 loading and reaches an extremum at its threshold. The adsorbent conversion of K2CO3/γ-Al2O3 at the threshold is up to 72%. When the loading is higher than the threshold, the SO2 adsorption Capacity decreases at first, then increases again. This phenomenon is caused by the reaction between SO2 and the bulk phase of K2CO3 crystallites. The sample decreases with the loading, and the sample with 0.10 [m (K2CO3)/m (γ-Al2O3), m/g] loading shows the highest regeneration percentage of 63%. Compared with Na2CO3/γ-Al2O3, K2CO3/γ-Al2O3 might have some advantages.