Metal salt modified molecular sieve and its preparation method and application
A technology of molecular sieve and metal salt, which is applied in the field of metal salt modified molecular sieve and its preparation, can solve the problems of high-temperature energy consumption process of activation pore expansion, high energy consumption of separation, low separation of nitrogen and methane, etc., and achieves a simple and controllable preparation method , high separation ratio and low cost
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[0039] The preparation method of the metal salt modified molecular sieve of the present invention comprises the following steps: after impregnating the molecular sieve with a metal salt solution, separating the solid from the liquid, drying the solid and then roasting to obtain the metal salt modified molecular sieve; wherein the metal salt is A salt , at least one of B salts, the A salt is lithium salt, sodium salt, potassium salt, rubidium salt or cesium salt; the B salt is aluminum salt, chromium salt, zinc salt, boron salt, titanium salt, vanadium salt salt, molybdenum salt or tungsten salt.
[0040] The study found that the molecular sieve is roasted after being impregnated in the metal salt solution, and the metal elements in it will interact with the hydroxyl groups in the molecular sieve, thereby adjusting the pore size of the molecular sieve to achieve the effect of partially adjusting the pores, so that it will generate shape selection when separating gases. role, es...
Embodiment 1
[0058] The lithium nitrate modified carbon molecular sieve is prepared by the following method:
[0059] 1) Configure a certain concentration of lithium nitrate aqueous solution: at room temperature, mix a certain amount of lithium nitrate with deionized water, and then stir it to completely dissolve lithium nitrate in water to obtain lithium nitrate with a concentration of 1 wt%. Aqueous solution, wherein, concentration is in the mass meter of lithium;
[0060] 2) Fully mix and stir the ground carbon molecular sieve (40-60 mesh) and lithium nitrate aqueous solution, then filter and separate the modified carbon molecular sieve solid impregnated with lithium nitrate, and dry the filter residue overnight at 150°C After drying, the dried sample was placed in a tube furnace and calcined at 300° C. for 4 hours under a nitrogen atmosphere to obtain the final lithium nitrate modified carbon molecular sieve sample.
Embodiment 2～3
[0062] By adopting the method of Example 1, only changing the concentration of the lithium nitrate aqueous solution, a series of carbon molecular sieves modified with lithium nitrate aqueous solutions of different concentrations were obtained, and the specific changed parameters are shown in Table 1.
[0063] Table 1
[0064] Example number Concentration of lithium nitrate aqueous solution (%) Example 1 1 Example 2 2 Example 3 3
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