Ionothermal post-synthesis for synthesis of functional heteroatomic molecular sieve
A technology of heteroatom molecular sieve and synthesis method, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalyst carriers, etc. It can solve the problems of tin sources that are easy to agglomerate, difficult to disperse, and difficult to control, and achieve low volatility and increase controllable variables , the effect of reducing the risk of stress
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Embodiment 1
[0047]Treat 3 g of Beta molecular sieve (silicon-aluminum ratio = 21) with concentrated nitric acid (concentration 65%) at 100°C for 24 hours at a liquid: solid ratio (weight ratio) of 20 to obtain Si-OH-rich Beta molecular sieve (silicon Aluminum ratio>2000).
[0048] Then in a reactor, take by weighing 100g of dissolved 1-butyl-3-methyl imidazolium chloride ionic liquid, add 1.5g of tin tetrachloride and vigorously stir the reaction for 4 hours, then add the Si-rich Si- Beta molecular sieve of OH was added, and the reaction was vigorously stirred for 4 hours to obtain a well-mixed crystallized mixture with a molar ratio of 1.0 SiO 2 :0.1SnO 2 :.
[0049] The prepared crystallization mixture was evenly mixed, then transferred to an open reaction kettle, and crystallized at 200° C. for 20 hours. After the crystallization is completed, the reactant is cooled to room temperature, filtered, washed and dried to obtain a tin-containing Beta heteroatom molecular sieve. The react...
Embodiment 2
[0051] Treat 3 g of borosilicate Beta molecular sieve (silicon-boron ratio = 25) with concentrated nitric acid (concentration 65%) at a liquid:solid ratio (weight ratio) of 20 for 10 hours under ultrasonically strengthened heating at 100°C to obtain Si-rich Beta molecular sieve of -OH (silicon to boron ratio>1300).
[0052] Then in a reactor, weigh 100g of the dissolved 1-ethyl-3-methylimidazolium chloride and tetraethylammonium chloride mixture (weight ratio 1:1) ionic liquid, add 0.15g of tin tetrachloride Stir vigorously for 4 hours, then add the Beta molecular sieve rich in Si-OH obtained above, and stir vigorously for 4 hours to obtain a uniformly mixed crystallized mixture with a molar ratio of 1.0 SiO 2 :0.01SnO 2 .
[0053] The prepared crystallization mixture was evenly mixed and then transferred to a closed reactor for crystallization at 100° C. for 240 hours. After the crystallization is completed, the reactant is cooled to room temperature, filtered, washed and ...
Embodiment 3
[0055] Treat 3 g of MCM-22 molecular sieve (silicon-aluminum ratio = 25) with concentrated nitric acid (concentration 65%) at 100°C for 24 hours at a liquid:solid ratio (weight ratio) of 20 to obtain Si-OH-rich MWW molecular sieves (Si-aluminum ratio>1900).
[0056] Then in a reactor, take by weighing 100g of dissolved 1-butyl-3-methyl imidazolium chloride salt ionic liquid, add 0.07g of titanium tetrachloride and stir it vigorously for 4 hours, then add the Si-rich Si- The MWW molecular sieve of OH was added, and the reaction was vigorously stirred for 4 hours to obtain a uniformly mixed crystallized mixture with a molar ratio of 1.0 SiO 2 :0.01TiO 2 .
[0057] The prepared crystallization mixture was evenly mixed, then transferred to an open reaction kettle, and crystallized at 200° C. for 20 hours. After the crystallization, the reactant was cooled to room temperature, filtered, washed and dried to obtain Ti-MWW molecular sieve. The reaction product has carried out the ...
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