Today we have a brief look at the cage of molecular sieves, and interested friends to look at it together.
Alpha cage: It is the main pore of the skeleton structure of type A molecular sieve. It is a hexahedron composed of 12 four-membered rings, eight six-membered rings and six eight-membered rings. The cage has an average pore diameter of 1.14 nm and a cavity volume of 760 [Å]3. The large window of the α cage is an eight-membered ring with a pore size of 0.41 nm.
The faujasite cage: is the main pore that constitutes the X-type and Y-type molecular sieve skeleton, and is composed of 18 four-membered rings, four six-membered rings and four twelve-membered rings. The pore size is 1.25 nm and the cavity volume is 850 [& Aring;] 3. The large aperture window is a twelve-element ring with a hole diameter of 0.74 nm. The faujasite cage is also called super cage.
Beta Cage: It is mainly used to form the skeleton structure of A-type, X-type and Y-type molecular sieves. It is an important kind of hole. Its shape is like a regular octahedron with a topping. The cavity volume is 160[Å]3. The window aperture is about 0.66 nm, allowing only smaller molecules such as NH3 and H2O to enter.
In addition, there are hexagonal column cages and gamma cages, which are small in size and generally do not enter the cage. The above information about the molecular sieve cage is briefly introduced here. If you have any other doubts, please feel free to contact us.