Co-crystallization molecular screen and preparation method and application thereof
A technology of co-crystallized molecular sieves and molecular sieves, which is applied in the fields of molecular sieves and base exchange compounds, chemical instruments and methods, and inorganic chemistry. high degree of effect
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Embodiment 1
[0028] Embodiment 1: the synthesis of pure MCM-22 molecular sieve
[0029] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.
[0030] Weigh 20.3g silica sol (containing SiO 2 is 26.6wt.%) and 55.6 grams of deionized H 2 O, then weigh 2.40mL NaOH solution (0.10g / mL), weigh 0.71g NaAlO 2 (Al 2 o 3 43%, Na 2 (051.5%), after all adding in the reactor mixing, finally add 3.2 grams of mixed template agent R, wherein HMI / CHA (weight)=4:1. The final raw material ratio (molar ratio) is SiO 2 / Al 2 o 3 =30,H 2 O / SiO 2 =45, R / SiO 2 =0.35,Na 2 O / SiO2 = 0.11. The remaining steps are the same as in Comparative Example 1. The resulting product is MCM-22, and the XRD spectrum is shown in figure 2 , its crystallinity is slightly better than Comparative Example 1.
Embodiment 2
[0031] Embodiment 2: Synthesis of ZSM-35 / MCM-22 co-crystal molecular sieve
[0032] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.
[0033] Weigh 20.3g silica sol (containing SiO 2 is 26.6wt.%) and 54.4 grams of deionized H 2 O, then weigh 3.58mL NaOH solution (0.10g / mL), weigh 0.53g NaAlO 2 (Al 2 o 3 43%, Na 2 (051.5%), after all adding in the reaction kettle and mixing, finally add 3.2 grams of mixed template agent R, wherein HMI / CHA (weight)=3:1. Its final raw material ratio (molar ratio) is SiO 2 / Al 2 o 3 =40,H 2 O / SiO 2 =45, R / SiO 2 =0.35,Na 2 O / SiO 2 = 0.11. The remaining steps are the same as in Comparative Example 1. The obtained product is ZSM-35 / MCM-22 co-crystal molecular sieve. The XRD spectrum of the molecular sieve after calcination is shown in image 3 , wherein the ZSM-35 molecular sieve accounts for ...
Embodiment 3
[0034] Embodiment 3: the synthesis of ZSM-35 / MCM-22 cocrystal molecular sieve
[0035] The ZSM-35 / MCM-22 co-crystal molecular sieve provided by the present invention is prepared by using silica sol as a silicon source and hexamethylene ethylene and cyclohexylamine as templates.
[0036] The specific steps are the same as in Example 1 except that the added template R is a mixture of 3.2 grams of hexamethylene ethylene and cyclohexylamine, wherein HMI / CHA (weight)=1:1. The obtained product is the original powder of ZSM-35 / MCM-22 co-crystal molecular sieve. The XRD spectrum of the molecular sieve after roasting is shown in Figure 4 , wherein the weight percentage of the crystalline phase containing the ZSM-35 structural part in the co-crystallized molecular sieve is 50%.
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