Abstract
An investigation was carried out to determine the possibility of preparing coatings of synthetic zeolites on stainless steel from mixtures containing natural zeolite. Hydrothermal synthesis was applied and the coatings obtained were characterized by various techniques. It was observed that crystalline zeolite A coatings could be prepared from natural clinoptilolite, which provided the silica necessary for zeolite synthesis in the alkaline reaction mixture containing alumina. Zeolite coating formation was affected by synthesis conditions, such as temperature, time, alkalinity, and alumina content of the reaction mixture. The involvement of two simultaneous processes, namely, dissolution/transformation of clinoptilolite in the mixture and reaction on the substrate by the help of dissolved reagents, presents a new approach for zeolite coating preparation. This method may especially provide a means for more economical mass-scale production of zeolite coatings since the synthetic reagents may be replaced with much cheaper natural resources.
Highlights
Zeolites have many useful existing and potential applications related to adsorption/separation, catalysis and ion-exchange
Zeolite A coatings could be prepared on stainless steel from mixtures containing clinoptilolite both when conventional and substrate heating synthesis methods were used
The coating mass increased with synthesis time and temperature
Summary
Zeolites have many useful existing and potential applications related to adsorption/separation, catalysis and ion-exchange. Zeolite coatings may be prepared by different techniques, the simplest of which involves the immersion of the substrate into the reaction mixture heated by a water bath/oven This conventional synthesis method is often insufficient in providing coatings with desired properties for different zeolites and applications. The preparation processes including zeolite powder sedimentation, semi-dry pressing, sintering of the support and the membranes, and dip coating of layers were systematically studied As another example, natural mordenite disks were used in lab-scale ethane dehydrogenation experiments in a membrane reactor to obtain increases in ethane conversion and ethylene yield compared to their equilibrium values[15]. The coatings prepared were characterized by X-ray diffraction (XRD), field emission gun scanning electron microscopy (FEGSEM) and thermogravimetry (TG)
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