The transformation of microporous, amorphous silica membranes into b-oriented silicalite-1 (MFI) zeolite layers via in-situ crystallisation was investigated. The effect of synthesis parameters, such as the type and concentration of the silica precursor, crystallisation time and temperature, on the morphology of silicalite-1 (MFI) zeolite layers was studied. By optimizing these parameters, silicalite-1 zeolite layers were formed from the already-deposited silica layers, which promotes the crystallisation from the surface in the preferred b-orientation. The use of a monomeric silica precursor, which has slower hydrolysis kinetics than a colloidal one, resulted in the formation of zeolite crystals via heterogeneous nucleation on the surface and suppressed the formation of crystal nuclei in the liquid media via homogeneous nucleation, which then would further deposit onto the surface in a random orientation. Lastly, by optimizing the crystallisation time and temperature of the synthesis, thickness, coverage and orientation of silicalite-1 zeolite layers were controlled.

通过原位将微孔无定形二氧化硅膜转变为b取向的silicalite-1（MFI）沸石层研究结晶。研究了二氧化硅前驱体的类型和浓度，结晶时间和温度等合成参数对silicalite-1（MFI）沸石层形态的影响。通过优化这些参数，可以从已经沉积的二氧化硅层中形成silicalite-1沸石层，从而以优选的b取向促进从表面的结晶。使用比胶体水解动力学慢的单体二氧化硅前驱体，可通过表面上的不均匀成核作用形成沸石晶体，并通过均相成核作用抑制液体介质中晶核的形成，进而进一步以随机方向沉积在表面上。最后，