This article introduces the analysis methods of zeolite molecular sieves.

It includes electron microscopy analysis, X-ray diffraction analysis, silica determination, and sodium oxide determination.

The composition of zeolite molecular sieve

This article discusses the effect of reaction ratio on the composition of X-type zeolite molecular sieve.

With the improvement of Na2O/SiO2 molar ratio, the crystallinity of zeolite molecular sieve is increased.

But when the molar ratio of Na2O/SiO2 exceeds 1.5, its crystallinity decreases with the addition of alkali.

Excessive Na2O/SiO2 ratio will promote the formation of stable P-type zeolite.

The purity of X-type zeolite decreases with the addition of H2O/Na2O molar ratio.

System water is an important factor affecting the crystal size of zeolite.

And it is also a successful factor in ensuring high crystallinity and pure crystal phase composition of X-type zeolite.

The effect of crystallization time on the composition of X-type zeolite molecular sieve.

The optimal crystallization time is 6 hours, and reducing the crystallization time by 0.5 hours reduces the crystallization of X-type zeolite from 92% to 87%.

The reason for the decrease is the shortened crystallization time.

The components in the system have not fully crystallized yet.

And the length of crystallization time not only affects the crystallinity of zeolite crystals.

But it also affects the grain size.

At the time of extended crystallization, the grain size increases.

The effect of room temperature aging of reaction mixture on the hydrothermal preparation of molecular sieve.

The temperature of zeolite molecular sieve during production process

After the reaction mixture is uniformly mixed, if it is not statically aged at room temperature before hydrothermal reaction.

But directly heated to 100 ℃ for hydrothermal reaction, the resulting products are all a mixture of X-type zeolite, P-type zeolite or A-type zeolite.

As long as the reaction mixture is statically aged at room temperature for a certain period of time.

And then it is heated for hydrothermal reaction.

The resulting product is pure 13X-type zeolite molecular sieve.

The influence of crystallization temperature on the composition of X-type zeolite.

Increasing the temperature can promote the solid phase dissolution and liquid phase concentration addition in the gel.

And then it accelerates the formation of crystal nucleus, which in turn can generate zeolite crystals. Increasing the temperature not only shortens the induction period.

But it also improves the crystallization speed and shortens the crystallization period.

During the composition process of X zeolite molecular sieve.

If vigorously mixed during crystallization, impurities may appear.

This article also discusses XRD analysis, SEM analysis, and IR analysis during the hydrothermal preparation process. Crystallization habits of X-type zeolite crystals, etc.

After the discussion in this article, the pure crystal phase of X molecular sieve was finally formed.

Through phase and chemical analysis, the crystal phase is pure 13X molecular sieve with a crystallinity of over 90%.

Thermal stability analysis and infrared spectroscopy analysis all match the characteristics of X molecular sieve.