Abstract
Hydrothermal, solvothermal or ionothermal routes are usually employed for the synthesis of zeolite, which is often accompanied by a high energy consumption, high cost and low efficiency. We have developed a novel route for the rapid and high yield synthesis of mordenite (MOR) zeolite via an ice-templating method. In comparison with traditional hydrothermal synthesis, not only the high yield, but also the superior crystallinity, large reduction in water level and reaction pressure, simple device and conventional silica sources by this route can have great potential for the commercial production of pure MOR zeolite. Moreover, the changed bonding environment of silicon atoms in MOR zeolite, that is, a relative decrease in the tetrahedrally coordinated Si–O–Si bond, and accordingly, an increase in the T–OH (T = Si, Al) groups and Si–O–Al sites, remarkably enhances its acid strength.
Highlights
Zeolites are microporous aluminosilicates or aluminophosphate materials with precisely uniform channels that play a significant role in chemical industry due to their excellent properties, such as high surface area, large pore volume, hydrothermal stability and strong acidity [1–3]
It indicates that the well–designed MOR zeolites were successfully synthesized via the ice-templating method in this work
This result clearly demonstrates that the crystallization rate of zeolites was accelerated by the ice-templating method, especially when the dry gel was crystallized under a desired Na2 O content
Summary
Zeolites are microporous aluminosilicates or aluminophosphate materials with precisely uniform channels that play a significant role in chemical industry due to their excellent properties, such as high surface area, large pore volume, hydrothermal stability and strong acidity [1–3]. The ice-templating method ( known as freeze casting or ice–segregation–induced self–assembly) has the advantages of versatility, cost efficiency and environmental friendliness in porous constructing technology It has been extensively used in the preparation of porous inorganic materials, the design of biological materials and even human tissue engineering [22–24]. Compared with traditional hydrothermal synthesis, it shows distinct advantages with respect to fast nucleation and crystallization, high crystallinity, high zeolite yields, simple device and conventional silica sources. Considering those “efficient” properties, it is believable that the ice-templating method is of significant importance for zeolites production
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