Modified lithium low-silicon zeolite molecular sieve and preparation method thereof
A technology of zeolite molecular sieve and silicon molecular sieve, which is applied in the direction of separation method, molecular sieve catalyst, crystalline aluminosilicate zeolite, etc., can solve the problems of less research on adsorption performance, and achieve superior selective adsorption performance, improved adsorption performance, and large pore size. Effect
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[0042] A method for preparing the modified low-silica X zeolite molecular sieve described above, comprising the following steps:
[0043] 1) Raw powder pretreatment
[0044] Dry sodium-type low silica X zeolite molecular sieve (Na-LSX) powder at 100-15°C for 1-3 hours, then heat up to 400-550°C at a rate of 5-10°C per minute and roast for 1-4 hours. hours, put it in a desiccator to cool for later use;
[0045] 2) Ion modification
[0046] 2.1) Lithium ion solution modification
[0047] Mix the above-mentioned pretreated Na-LSX raw powder with 0.1-0.5mol / L lithium ion solution, so that the molar ratio of sodium ions in the Na-LSX raw powder to lithium ions in the solution is within the range of 1:0.4-1:2.0 , and stirred at 85-95°C for 1-2 hours, then filtered and washed; the washed solid powder was re-added to the above-mentioned lithium chloride solution, and the above-mentioned process was repeated, so that the lithium-ion exchange degree was within the range of 65-99%. E...
Embodiment 1
[0064] Take 100g of pretreated Na-LSX zeolite molecular sieve and mix it with a lithium chloride solution with a concentration of 0.5mol / L, so that the molar ratio of sodium ions in the original Na-LSX powder to lithium ions in the solution is 1.5, and maintain at 85°C under stirring Constant temperature for 2 hours, filter and wash; mix the washed sample with the above lithium chloride solution again, repeat the mixing, constant temperature stirring, filter and wash for a total of 3 times, then dry the sample at 100°C for 2 hours, and then bake it at 450°C for 1 After 1 hour, the (Li, Na)-LSX zeolite molecular sieve was obtained.
[0065] The above-mentioned low-silicon molecular sieve modified by lithium ions is fully mixed with a 20% mass ratio binder, and the binder is sheepskin; forming adopts rolling ball molding. The formed spherical molecular sieve is calcined under vacuum or inert gas protection in the temperature range of 400°C for 12 hours, and cooled under the prot...
Embodiment 2
[0068] Take 10g of pretreated Na-LSX zeolite molecular sieve and mix it with a lithium nitrate solution with a concentration of 0.1mol / L, so that the molar ratio of sodium ions in the original Na-LSX powder to lithium ions in the solution is 0.6, and maintain a constant temperature of 95°C under stirring for 2 hours, filtered and washed; the washed sample was re-mixed with the above lithium nitrate solution, repeated mixing, constant temperature stirring, filtered and washed twice, and then the sample was dried at 100°C for 3 hours, and then roasted at 450°C for 1 hour to obtain (Li, Na)-LSX zeolite molecular sieve.
[0069] The above-mentioned low-silicon molecular sieve modified by lithium ions is fully mixed with a 5% mass ratio binder, and the binder is kaolin; extrusion molding is adopted for molding. The strip-shaped molecular sieve after forming is roasted for 2 hours under vacuum or inert gas protection within the temperature range of 550°C, and cooled under the protec...
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