摘要
为了获得高性能Silicalite-1沸石膜,采用提拉法在大孔α-Al2O3载体上制备了Silicalite-1/TiO2复合过渡层,再在此过渡层上水热合成Silicalite-1沸石膜。探讨了过渡层中Silicalite-1晶种对成膜性能的影响,并采用XRD、SEM和单组分气体渗透测试对Silicalite-1沸石膜进行表征。结果表明,采用该方法合成得到了典型的Silicalite-1沸石膜,没有其它杂晶出现,同时缩短了传统水热合成法的成膜周期。所得Silicalite-1沸石膜层薄而致密,晶粒小而均匀,没有大的缺陷,紧密围绕载体表面生长。在25℃、0.1 MPa条件下,该Silicalite-1沸石膜的H2渗透速率为1.0×10-6mol/(m2.s.Pa),H2/SF6理想分离因数达到205.4;在200℃、0.1 MPa条件下,H2渗透速率达到2.1×10-6mol/(m2.s.Pa),H2/N2理想分离因数达到3.5。
To obtain high quality zeolite membranes for hydrogen separation and purification, Silicalite-1 membranes were successfully prepared on Silicalite-1/TiO2 intermedia 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（25℃）, the as-prepared composite membrane had a high permeance of H2 and ideal separation factor of H2/SF6, which were up to 1.0×10^-6 mol/（m^2·s·Pa） and 205.4 with the trans-membrane pressure drop of 0.1 MPa, respectively. When the temperature rose up to 200℃, the permeance of hydrogen and ideal
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2009年第1期53-58,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(2066004)资助
