Abstract
The crystallization processes of ZSM-5 zeolite from mixture of colloid silica, sodium aluminate, sodium hydroxide and tetrapropyl ammonium bromide at 150–195°C were studied. As the temperature increases, crystallization time decreases, crystal size becomes smaller, and the distribution becomes narrower. The rate of nuclei formation is deduced from the size distribution of final product under the assumption that crystal is growing at constant rate from the nuclei formed during the induction period. The rate of nuclei formation is also accelerated with temperature increase. When the rate constants of the crystal growth are 0.012–0.170 μm·min1 at 150–195°C, the crystallization curves can be simulated with the rate equation of nuclei formation deduced from the crystal size distribution of the final product.
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Abbreviations
- A:
-
constant of Eq. (1) in particle size distribution
- B:
-
constant of Eq. (1) in particle size distribution
- k app :
-
apparent rate constant for zeolite growing defined as kcrys·s
- kcrys :
-
rate constant of zeolite growth
- 1i :
-
the length of crystals
- li(t):
-
the crystal length at time t
- ti(tf):
-
the crystal length at time tf
- lmax :
-
length of the largest crystal of the final product
- lmin :
-
length of the smallest crystal of the final product
- Nc :
-
total number of crystals
- nci :
-
number of crystals with length 1,
- Nn :
-
total number of nuclei
- nni :
-
number of nuclei formed at time t¦ni}
- s:
-
fraction of soluble species in reactant
- t:
-
crystallization time
- ta :
-
the time that all the amorphous solid phase is disappeared
- tf :
-
the final time of the crystallization process
- tm :
-
the time of nuclei formation for crystal with length 1i
- tno :
-
the initial time of nucleation
- t nf :
-
the final time of nucleation
- Z:
-
fraction of zeolite
- Z f :
-
the amount of zeolite formed at end time
- Zt :
-
the amount of zeolite formed at time t
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Chung, K., Kim, K. & Seo, G. The rate of nuclei formation of ZSM-5 zeolite. Korean J. Chem. Eng. 9, 144–149 (1992). https://doi.org/10.1007/BF02705131
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DOI: https://doi.org/10.1007/BF02705131