[Reaction of SO2 over CaAl mixed oxides derived from hydrotalcites samples].

Series of CaAl hydrotalcite-like compounds were synthesized by co-precipitation, and the oxides were obtained after being calcined at 800 degrees C. XRD, BET, DTG and TPD were taken to characterize the physicochemical properties of samples, and reactions of SO2 over samples were studied. Results show that precursors were homogeneous and well crystallographic, and after being calcined with taking off the interlayer hydroxyls, water and anion, forming CaO and (CaO)x(Al2O3)y, and the Ca element enhances the thermal stability, Ca3AI-LDO has the largest surface area, the highest pore volume and the most basic center, the saturation capacity was 0. 29 g x g(-1) at 700 degrees C.