Effect of the support on the structural characteristics of tin

Tin oxide was supported on alumina, titania, magnesia and silica, treated w ith hydrogen at different temperatures and characterized by Mossbauer spect roscopy and X-ray diffraction. For the samples calcined at 773 K, tin is pr esent as SnO2 on alumina, magnesia and silica, but it occupies Ti sites on titania, After hydrogen treatment at high temperatures, tin is reduced from Sn(IV) to Sn(II) on alumina and titania, from Sn(IV) to Sn(0) on silica, b ut practically not reduced on magnesia. These results show the different de gree of interaction between tin and the supporting material.