The gram fraction ratio of usable oxygenates in the chemical composition of zsm-5 boiling stone is shown as 0.9 ±
0.2m2 /nO:Al2O3:5-- -100sio2 :ZH2O, where M is cation (alkali metal sodium ion and organic amine ion);n
Is the valence number of cations;Z goes from 0 to 40.
Zsm-5 zeolite has a high ratio of silicon to aluminum, according to the need to synthesize different ratio of silicon to aluminum molecular sieve and can
Range from 10 to over 3000.
The zsm-5 zeolite contains a 10-membered ring, and the basic structural unit is composed of eight 5-membered rings.Its crystal structure belongs to
Rhombic crystal system, space group Pnma, lattice constant a=20.1 a, b=19.9 a, c=13.4 a.It has a special structure
There are A type A, X and Y zeolite like cage, the hole is its cavity.The skeleton consists of two intersecting channels
The straight cylindrical channel is elliptic, with A long axis of 5.7 ~ 5.8a and A short axis of 5.1 ~ 5.2a.The other one is Z.
Font transverse channel, cross section is close to the circle, the aperture is 5.4± 0.2a.It belongs to zeolite.Zigzag channel fold
This is 110 degrees.The sodium ion is located on the symmetrical plane of the 10-membered ring channel.Its anion skeleton density is about 1.79 g/cm
3.Therefore, the crystal structure of zsm-5 zeolite is very stable.
