The Study Of Synthesis And Properties Of ZSM-5 Zeolite Membrane On Stainless Steel Wire Mesh Substrate

ZSM-5 zeolite membranes have drawn increasing attention in many fields because of their excellent characteristics such as thermal stability, ion exchange ability, acidity, molecular sieving and catalysis, compared with other inorganic membrane materials. Owing to the good properties of stainless steel materials, in this paper, stainless steel wire mesh was chosen as the substrate to prepare ZSM-5 zeolite membrane. The anodic oxidation techonology was applied to modify the stainless steel wire mesh surface so that ZSM-5 zeolite membrane can grow well. The ZSM-5 zeolite membranes prepared were characterized by XRD, SEM, EDX to study the preparation and properties of the membranes. The results we got were listed as follows:1. The influence of different pre-treatment methods of stainless steel wire mesh for the growth of ZSM-5 zeolite membrane on the stainless steel was studied. It was found that the anodic oxidation technique was more favorable for the growth of ZSM-5 zeolite membrane. Other factors were also investigated. Under the conditions of the hydrothermal synthesis temperature 180℃, the hydrothermal synthesis time 96h and the calcination rate 0.5℃/min, the ZSM-5 zeolite membrane showed best quality. Besides, increasing synthesis times was also good for the growth of ZSM-5 membrane.2. Ti-ZSM-5 membrane was successfully prepared on stainless steel wire mesh substrate. The degradation photocatalysis of methyl orange was chosen as the model reaction to study its photocatalysis activity. The effect of time of photocatalysis and the initial concentration of methyl orange on the degradation photocatalysis of methyl orange were both investigated. The results showed that the decolour ratio of methyl orange increases with the time of photocatalysis and its intial concentration. Moreover, under the same condition, Ti-ZSM-5 membrane showd better photocatalysis activity compared with P25.3. Cu/stainless steel wire mesh catalysts was synthesized via electrochemical deposition method. The influence of electrochemical deposition time on preparation of the Cu/stainless steel wire mesh catalysts was studied. It was found that the Cu active compounds dispersed well on the surface of stainless steel wire mesh as the electrochemical deposition time was 15min. On this basis, a dual functional material of ZSM-5@Cu/SSWM was prepared. XRD, SEM, EDX characterization results indicated that CuO particles were fully wrapped by ZSM-5 membrane. The schematic representation of the forming process of the "sandwich" structure of ZSM-5@Cu/SSWM was given. Besides, the reaction models on ZSM-5@Cu/SSWM were exhibited from the two aspects of reactants selectivity and products selectivity.