A kind of highly dispersed small grain ZSM-5 molecular sieve and preparation method thereof
A ZSM-5, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of irregular crystal form and easy agglomeration, and achieve regular crystal form and difficult to agglomerate. , increasing the effect of steric hindrance
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Embodiment 1
[0064] Take 6g of NaOH, add 80g of deionized water to it, make it fully dissolved, then add 10g of urea, stir and dissolve, put it in -20°C environment for 2 hours and refrigerate it for 2 hours; take 4g of cotton linter pulp, add the above NaOH / Degrade in urea / water solution, centrifuge to obtain degradation solution, and store at -10°C. Take 18g of sodium hydroxide, 4g of sodium metaaluminate, and 40g of tetrapropylammonium bromide, and dissolve them in 150g of deionized water; take 250g of silica sol and 30g of degradation solution, and slowly add them dropwise to the aluminum salt solution, and then add NaOH Adjust the pH value to 14; put the reaction mixture into a reaction kettle, crystallize at 100°C for 36 hours, then raise the temperature to 170°C, and crystallize for 24 hours. After filtering, washing and drying, the average grain size of the obtained product is About 100nm, SiO 2 / Al 2 o 3 for 30. Its XRD pattern is as figure 1 As shown, the SEM image is shown...
Embodiment 2
[0066] Take 7g of NaOH, add 80g of deionized water to it, make it fully dissolved, then add 12g of urea, stir and dissolve, put it in -20℃ for 2 hours; take 4g of cotton linter pulp, add the above NaOH / Degrade in urea / water solution, centrifuge to obtain degradation solution, and store at -10°C. Take 20g of sodium hydroxide, 6.8g of aluminum isopropoxide, and 40g of tetrapropylammonium bromide, and dissolve them with 250g of deionized water; take 100g of white carbon black and 30g of degradation solution, and slowly add them dropwise to the aluminum salt solution, and then Add NaOH to adjust the pH value to 14; put the reaction mixture into the reaction kettle, crystallize at 100°C for 36 hours, then raise the temperature to 170°C, and crystallize for 24 hours. After filtering, washing and drying, the average crystal grain The size is around 70nm, SiO 2 / Al 2 o 3 for 40.
Embodiment 3
[0068] Take 6g of NaOH, add 80g of deionized water to it, make it fully dissolved, then add 10g of urea, stir and dissolve, put it in -20°C environment for 2 hours and refrigerate it for 2 hours; take 4g of cotton linter pulp, add the above NaOH / Degrade in urea / water solution, centrifuge to obtain degradation solution, and store at -10°C. Take 20g of sodium hydroxide, 2g of sodium metaaluminate, and 40g of tetrapropylammonium bromide, and dissolve them in 250g of deionized water; take 100g of coarse-pore silica gel and 30g of degradation solution, and slowly add them dropwise to the aluminum salt solution, and then add Adjust the pH value to 14 with NaOH; put the reaction mixture into a reaction kettle, crystallize at 100°C for 36 hours, then raise the temperature to 170°C, and crystallize for 24 hours. After filtering, washing and drying, the average grain size of the obtained product is Around 100nm, SiO 2 / Al 2 o 3 for 50.
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