Microwave assisted method for synthesizing CHA molecular sieve from gangue
A microwave-assisted, coal gangue technology, which is applied in the fields of resource utilization and energy saving and emission reduction, can solve the problems of high preparation cost, environmental pollution, and long synthesis time of SSZ-13, so as to reduce synthesis time and preparation cost and improve utilization The effect of high efficiency and high output
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Embodiment 1
[0032] Embodiment 1: a kind of method for microwave-assisted coal gangue synthesis CHA molecular sieve, concrete steps are as follows:
[0033] Step 1: pulverizing and grinding the coal gangue, and passing through a 200-mesh sieve to obtain coal gangue powder with uniform particle size;
[0034] Step 2: Take 0.1762g KOH solid and dissolve it in 26.1832g distilled water (that is, the molar concentration of the KOH solution is 0.12mol / L), and after the KOH solid is completely dissolved, add 0.2001g of coal gangue powder with a silicon-aluminum molar ratio of 2.0 (over 200 Mesh sieve), after stirring for 60min, mixed solution A was obtained;
[0035] Step 3: Add 6.3252 g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide with a mass fraction of 25% to the mixed solution A obtained in Step 2, and continue stirring for 60 minutes to obtain a mixed solution B;
[0036] Step 4: Add 1.1320g of white carbon black to the mixed solution B obtained in Step 3, and continue to stir for 60mi...
Embodiment 2
[0039] Embodiment 2: A method for synthesizing CHA molecular sieves from microwave-assisted coal gangue. The basic steps are the same as in Embodiment 1. The difference is that in step 5, the crystallization time is changed from 12h to 18h, and the obtained crystal structure is better after filtering, drying and roasting. SSZ-13 type molecular sieve.
[0040] Depend on figure 1 Comparing the XRD patterns of standard and 2, it can be seen that the molecular sieve synthesized in Example 2 belongs to the pure phase CHA type zeolite molecular sieve. According to FIG. 3(B), it can be seen that the crystallization effect of the molecular sieve prepared in Example 2 is better, and the crystal block is relatively uniform.
[0041] According to Examples 1 and 2, it can be seen that as the crystallization time increases, the amorphous state of the synthesized SSZ-13 gradually decreases, and the crystal structure gradually becomes better.
Embodiment 3
[0042] Embodiment three: a kind of method for microwave-assisted gangue synthesis CHA molecular sieve, basic steps are the same as embodiment one, difference is: the molar concentration of KOH solution in step two becomes 0.5mol / L by 0.12mol / L, stirring time Changed from 60 min to 90 min; in step five, the crystallization temperature was changed from 160°C to 180°C, and finally an SSZ-13 analytical sieve with a better crystal structure was obtained.
[0043] Depend on figure 2 Comparing the XRD patterns of standard and 3, it can be seen that the molecular sieve synthesized in Example 3 belongs to the pure phase CHA type zeolite molecular sieve. Fig. 3 (C) is a relatively pure cubic block, illustrating that the crystallization effect of the molecular sieve synthesized in Example 3 is better.
[0044]According to 1 and 3, it can be seen that increasing the concentration of KOH solution, prolonging the stirring time, and increasing the crystallization temperature can reduce the...
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