Nano-class molecular sieve and its synthesizing process
A synthesis method and molecular sieve technology, applied in the field of nano-scale MCM-49 molecular sieve and its synthesis, can solve the problems such as the difference in the distribution of aluminum atomic skeletons, and achieve the effects of shortening the crystallization time, short crystallization time, and high utilization of raw materials
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Embodiment 1
[0012] 4.564 grams of sodium aluminate (Al 2 o 3 44.7 wt%, Na 2 O 39.2% by weight) is dissolved in 80 grams of water, adds 20ml organic template agent hexamethyleneimine under stirring condition, then adds silica sol (SiO 2 25% by weight, Na 2 O 0.2% by weight) 120 g. The material ratio (molar ratio) of reactant is:
[0013] SiO 2 / Al 2 o 3 =25
[0014] Oh - / SiO 2 =0.12
[0015] R / SiO 2 =0.35
[0016] h 2 O / SiO 2 =18.9 After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 170°C for 72 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 24.5. The crystal is characterized by a transmission electron microscope as a flaky hexagonal single crystal with a diameter of 300-500 nm and a thickness of 25-100 nm. B...
Embodiment 2
[0018] Dissolve 3.8 grams of sodium aluminate in 80 grams of water, add 20ml of organic template hexamethyleneimine under stirring conditions, then add silica sol (SiO 2 25% by weight) 120 g. The material ratio (molar ratio) of reactant is:
[0019] SiO 2 / Al 2 o 3 =30
[0020] Oh - / SiO 2 =0.11
[0021] R / SiO 2 =0.35
[0022] h 2 O / SiO 2 =18.9 After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 170°C for 72 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 29. The crystal is characterized by a transmission electron microscope as a flaky hexagonal single crystal with a diameter of 300-500 nm and a thickness of 25-100 nm.
Embodiment 3
[0024] Dissolve 4.564 grams of sodium aluminate in 80 grams of water, add 20 ml of organic template agent hexamethyleneimine under stirring conditions, then add silica sol (SiO 2 25% by weight) 120 g. The material ratio (molar ratio) of reactant is:
[0025] SiO 2 / Al 2 o 3 =25
[0026] Oh - / SiO 2 =0.12
[0027] R / SiO 2 =0.35
[0028] h 2 O / SiO 2 =18.9 After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 180°C for 36 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 24.5. The crystal is characterized by a transmission electron microscope as a sheet-like hexagonal single crystal with a diameter of 200-450 nm and a thickness of 30-80 nm.
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