Preparation method of cha molecular sieve synthesized by using tetraethylenepentamine as template
A technology of tetraethylenepentamine and templating agent, applied in the direction of molecular sieves and base exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low solid phase yield, high price, poor crystallinity, etc., and achieve solid phase High yield, good crystallinity, and the effect of reducing production cost
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Embodiment 1
[0024] Embodiment 1: take tetraethylenepentamine as the preparation method of synthesizing CHA molecular sieve as template, the steps are as follows:
[0025] Step 1: Weigh 2.09g phosphoric acid and add it to 7ml deionized water and mix evenly, then weigh 1.36g pseudo-boehmite and add it to the above solution, the Al in the pseudo-boehmite 2 o 3 The content of is 75%, stirred at room temperature for 1 h to obtain mixed solution A.
[0026] Step 2: Weigh 1.97g of silica sol and add it to the mixed solution A. SiO in the silica sol 2 The content is 40% and stirred at room temperature for 30min to obtain mixed solution B.
[0027] Step 3: Weigh 3.38g of tetraethylenepentamine and add it dropwise to the mixed solution B, and continue to stir for 1h to obtain a milky white uniform mixed gel, and the mixed gel contains Al 2 o 3 :P 2 o 5 : SiO 2 : Tetraethylenepentamine: H 2 The molar ratio of O is 1:0.9:0.9:1.6:52.
[0028] Step 4: Transfer the homogeneous gel mixture obtai...
Embodiment 2
[0030] Example 2: A preparation method for synthesizing CHA molecular sieves using tetraethylenepentamine as a template. The basic steps of its preparation are the same as in Example 1, except that the crystallization condition in step 4 changes from crystallization at 200°C for 4 days to 160 CHA-type molecular sieve was finally obtained after crystallization at ℃ for 4 days, but the crystallinity was poor, and there was a part of amorphous gel state.
Embodiment 3
[0031] Example 3: The preparation method for synthesizing CHA molecular sieves using tetraethylenepentamine as a template. The basic steps of its preparation are the same as in Example 1, except that in step 4, the crystallization condition changes from crystallization at 200°C for 4 days to 160 CHA molecular sieve with better crystallinity and higher yield was finally obtained after crystallization at ℃ for 6 days. Such as figure 2 The XRD characterization diagram shown.
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