A kind of method for preparing compound molecular sieve
A composite molecular sieve and molecular sieve technology, applied in molecular sieves and base exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problem of synergistic catalysis of Y and ZSM-5 molecular sieves, which cannot be realized The close contact and uniform dispersion of molecular sieves, the degree of in-situ growth of the second phase molecular sieves cannot be guaranteed, etc., to achieve good industrial application prospects, broad industrial application prospects, and fast diffusion effects
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Embodiment 1
[0039] Taking by weighing 1.4 gram mass concentration respectively is the tetrapropyl ammonium hydroxide solution of 20wt% and 1.5 gram H type Y molecular sieves (sample name Y 1 ; Si-Al ratio: 10.8). At room temperature, slowly and evenly drop 1.4 grams of the above-mentioned tetrapropylammonium hydroxide solution into the above-mentioned molecular sieve channel and impregnate evenly, and then transfer the obtained sample directly into a PTFE-lined stainless steel pressure-resistant reaction kettle with a volume of 5mL , then place the sealed reactor in a 150°C oven for crystallization for 24 hours to obtain the Y / ZSM-5 composite molecular sieve product (sample name ZSM-5 1 / Y 1 ;), the X-ray diffraction pattern and the scanning electron microscope figure of this sample are respectively as figure 1 and figure 2 shown.
Embodiment 2
[0041] Taking by weighing 1.7 gram mass concentration respectively is the tetrapropyl ammonium hydroxide solution of 20wt% and 1.5 gram Na type Y molecular sieves (sample name Y 2 ; Si-Al ratio: 10.8). At room temperature, slowly and uniformly drop 1.7 g of the above-mentioned tetrapropylammonium hydroxide solution into the above-mentioned molecular sieve channels to impregnate evenly, and then place the obtained sample at room temperature and dry in static air for 24 hours. Afterwards, the powder was transferred into a polytetrafluoro-lined stainless steel pressure-resistant reactor with a volume of 5mL, and then the sealed reactor was placed in a 150°C oven for crystallization for 24 hours to obtain the Y / ZSM-5 composite molecular sieve product (sample Name ZSM-5 2 / Y 2 ;), the X-ray diffraction pattern and the scanning electron microscope figure of this sample are respectively as image 3 and Figure 4 shown.
Embodiment 3
[0043] Take by weighing 1.0 gram mass concentration respectively and be the tetrapropyl ammonium hydroxide solution of 20wt% and 1.0 gram H type Y molecular sieve (sample name Y 3 ; Si-aluminum ratio: 15). At room temperature, slowly and evenly drop 1.0 g of the above-mentioned tetrapropylammonium hydroxide solution into the above-mentioned molecular sieve channel to impregnate evenly, and then transfer the obtained sample directly into a polytetrafluoro-lined stainless steel pressure-resistant reaction kettle with a volume of 5mL , then place the sealed reactor in a 150°C oven for crystallization for 24 hours to obtain the Y / ZSM-5 composite molecular sieve product (sample name ZSM-5 3 / Y 3 ;), the X-ray diffraction pattern and the scanning electron microscope figure of this sample are respectively as Figure 5 and Figure 6 shown.
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