Process for preparing MFI type molecular sieve membrane by heat treatment seed layer
A molecular sieve and seed layer technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, silicon dioxide, etc., can solve the problem of destroying the b-axis orientation, poor flatness and compactness of MFI molecular sieve membranes, and weak hydrogen bond forces and other problems, to achieve the effect of simple and fast treatment method, enhanced force, and dense film layer
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Embodiment 1
[0025] The MFI molecular sieve seed crystal powder (about 1 micron in size) was coated on the surface of the glass support by manual self-assembly method, and the obtained b The glass sheet of the axis-oriented seed layer, the scanning electron microscope picture of the seed layer is as follows figure 1 As shown, the X-ray diffraction pattern is as figure 2 shown. The above seed layer was placed in an oven and treated at 150°C for 3 hours. The molar ratio is tetrapropylammonium hydroxide: tetraethoxysilane: water = 0.2:1:2000 synthetic solution is aged and then put into the synthesis kettle, and then put into the seed layer without heat treatment and after heat treatment , the synthesis liquid submerges the support body, seals the synthesis kettle and synthesizes at 150°C for 4 hours, and obtains an MFI molecular sieve membrane on the support body after washing and drying. The surface smoothness and compactness of the MFI film obtained after the growth of the seed layer wi...
Embodiment 2
[0027] The preparation method of the seed layer is the same as in Example 1, and the support body is a stainless steel sheet. The above seed layer was placed in an oven and treated at 180°C for 1 hour. Aging the synthesis solution with a molar ratio of tetrapropylammonium hydroxide: tetraethoxysilane: water = 0.2:1:2000, put it into the synthesis kettle, put it into the heat-treated seed layer, and immerse it in the synthesis solution The support body was synthesized at 150°C for 4 hours after the synthesis kettle was sealed. After washing and drying, a flat and dense MFI molecular sieve membrane was obtained on the support body. The scanning electron microscope picture is as follows: Figure 7 shown.
Embodiment 3
[0029] The preparation method of the seed layer is the same as in Example 1, and the support body is a stainless steel sheet. The above seed layer was placed in an oven and treated at 120°C for 8 hours. Aging the synthesis solution with a molar ratio of tetrapropylammonium hydroxide: tetraethoxysilane: water = 0.2:1:2000, put it into the synthesis kettle, put it into the heat-treated seed layer, and immerse it in the synthesis solution For the support body, the synthesis kettle was sealed and synthesized at 150°C for 4 hours. After washing and drying, a flat and dense MFI molecular sieve membrane was obtained on the support body.
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