A method for preparing Y-type molecular sieves with high silicon-aluminum ratio
A high-silicon-aluminum ratio, molecular sieve technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problem of high synthesis cost, complicated synthesis steps of high-silicon Y zeolite, and adverse environmental effects. Large and other problems, to achieve the effect of low synthesis cost, low cost, and small adverse effects
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Embodiment 1
[0042] The specific batching process is as follows: dissolve 1.93g of sodium hydroxide in 30g of deionized water, then add 2g of sodium metaaluminate (Al 2 o 3 The mass percentage composition is 62%), stirs to clarification, adds the choline chloride (CHCl) of 3.38g; Then adds 24.3g silica sol (SiO 2 The mass percentage is 29.9%) to obtain an initial gel mixture; the initial gel mixture was stirred at room temperature for 12 hours to make a homogeneous gel mixture; the homogeneous gel mixture was transferred to a stainless steel autoclave. The molar ratio of each component in the synthesis system is 10SiO 2 :1Al 2 o 3 :3Na 2 O:2CHCl:220H 2 O. The specific feed ratio is listed in Table 1.
[0043] The autoclave was sealed and placed in an oven raised to a constant temperature of 110°C for static crystallization under autogenous pressure for 10 days. After the crystallization, the solid product was centrifuged, washed with deionized water until neutral, and dried in air ...
Embodiment 2
[0045] In embodiment 2, add 2.13g sodium hydroxide, other feeding ratio, steps and processing method are the same as embodiment 1, and the molar ratio of each component of synthetic system is 10SiO 2 :1Al 2 o 3 Method is the same as Example 1, and the molar ratio of each component of the synthetic system is 10SiO2: 1Al2O3.2Na 2 O:2CHCl:220H 2 O. The specific feed ratio is listed in Table 1. In an oven at a constant temperature of 110°C, static crystallization was carried out for 8 days. After centrifugation and drying, the product Y-CHCl-2 is obtained. The XRD pattern of Y-CHCl-2 is shown in figure 2 . Simultaneously by XRF and 29 Si MAS NMR was used to measure the composition of the product, and the ratio of silicon to aluminum was calculated. The specific results are shown in Table 1.
Embodiment 3
[0047] In embodiment 3, add 1.69g choline chloride, other feeding ratio, steps and processing method are the same as embodiment 1, and the molar ratio of each component of synthetic system is 10SiO 2 :1Al 2 o 3 :3Na 2 O:1CHCl:220H 2 O. The specific feed ratio is listed in Table 1. In an oven at a constant temperature of 110°C, static crystallization was carried out for 10 days. After centrifugation and drying, the product Y-CHCl-3 is obtained. The XRD pattern of Y-CHCl-3 is shown in image 3 . Simultaneously by XRF and 29 Si MAS NMR was used to measure the composition of the product, and the ratio of silicon to aluminum was calculated. The specific results are shown in Table 1.
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