Silicalite-1 membranes were prepared on Silicalite-1/TiO2 intermediate layer supported by porous tubular α-Al2O3, consisting of titanium dioxide and Silicalite-1 seeds. The influence of seed layer on the performance of the membrane was studied. XRD, SEM and single-gas permeation tests were used to characterize the final membrane. The results showed that this method shortened the synthesis period greatly, and the as-prepared membrane was typical Silicalite-1 membrane with no evidence of other zeolitic crystalline phase. The as-prepared membrane was thin and dense, with no large defects and its crystals were small and uniform. At room temperature (25C), the as-prepared composite membrane had a high permeance of H2 and ideal separation factor of H2/SF6, which were up to 1.0 x 10-6mol/m2sPa and 205.4 with the trans-membrane pressure drop of 0.1MPa, respectively. When the temperature rose to 200C, the permeance of hydrogen and ideal separation factor of H2/N2 were up to 2.1 x 10-6mol/m2sPa and 3.5, respectively.

Preparation and Characterization of Silicalite-1 Membrane on a Silicalite-1/TiO2 Composite Layer. W.Xiao, C.L.Kong, Q.Y.Zhao, J.Q.Wang: Acta Petrolei Sinica, 2009, 25[1], 53-8