SO2 storage was performed on CuTa2O6 and its derivatives by repeating file cycle of oxidative sorption ISO2 1000 ppm; O-2, 3%) and reductive desorption (H-2, 10%). Tantalum promoted the sorption of SO2 on and the synergetic oxidative sorption of copper and tantalum was investigated after several cycles. Observation of the specific surface areas of samples revealed that SO2, was absorbed also ill the bulk or catalysts through synergetic oxidative sorption. XRD observation showed that the samples undergoing synergetic oxidative sorption were amorphous. Through observation of ammonia-TPD, it was found that the samples were comparable to super acid. Synergetic oxidative sorption was investigated oil the physical mixture of copper oxide and tantalum oxide, as well as on the mixed oxides or CuO and MO (M = Nb, Cr, Ti and Zr).