By preparation of tin-ferrierites, tin-silicalites, tin-mordenites and tin-zeolite-Y's it was shown that the treatment of H-zeolites with tin(II) chloride dihydrate was a general method for preparing tin-zeolites. In the syntheses a part of the tin was ion-exchanged with protons in the H-zeolite and excess tin(II) chloride was converted in an oxygen atmosphere to tin(IV) oxide and tin(IV) chloride. Syntheses of the tin-zeolites on a thermobalance confirmed the results. X-ray analyses show a small change in the b-axis for tin-mordenites and a transition from monoclinic to orthorhombic for the tin-silicalites. The highest ac bulk conductivity at 100% relative humidity ranged from 10−2S/cm for tin-mordenites to 10−3S/cm for the other tin-zeolites. All of the tin-zeolites were proton conductors.

Tin-Zeolites, Syntheses and Ionic Conductivity. N.Knudsen, E.Krogh Andersen, I.G.Krogh Andersen, P.Norby, E.Skou: Solid State Ionics, 1993, 61[1–3], 153–61