ZSM-5 zeolite films on cordierite modules. Effect of dilution on the synthesis medium

摘要

Continuous, multilayered ZSM-5 zeolite films have been grown by direct synthesis on cordierite modules. the influence of the H_2O/SiO_2 ratio used in the synthesis mixture on the film properties was studied by inspecting the film formed in the external module surface at several water contents. It is shown that dilution prevents the film to become dense, modifies zeolite crystal morphology and reduces markedly the crystallization of zeolite into a non-adhered powder form.