CO2 high-selectivity adsorbent as well as preparation method and adsorption test method thereof
A high-selectivity, adsorbent technology, applied in the field of molecular sieves, can solve the problems of unfavorable reuse, low selectivity, low purity, etc., and achieve the effect of abundant channels
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Example Embodiment
[0037] Example 1
[0038] This embodiment provides a CO 2 Method for preparing a highly selective adsorbent comprising CO 2 The preparation and molding of high-selectivity molecular sieves are two steps.
[0039] Among them, CO 2 The preparation of high selectivity molecular sieve includes steps:
[0040] S1: Take 300g of 0.2mol / L KCl solution and preheat to 30℃;
[0041]S2: Weigh 30 g of 4A molecular sieve, that is, the solid-liquid mass ratio of 4A molecular sieve and KCl solution is 1:10; wherein, 4A molecular sieve was purchased from Nankai University, and the silicon-aluminum ratio is about 2.05.
[0042] S3: Add the weighed 30g 4A molecular sieve into the preheated KCl solution, and under the condition of 30°C, stir at 400 rpm, carry out ion exchange, and exchange for 1 h;
[0043] S4: After ion exchange for 1 h, the solution was removed by filtration, and the molecular sieve was washed with pure water or desalinated water to wash away KCl and exchanged Na in the mo...
Example Embodiment
[0058] Example 2
[0059] The difference between this embodiment and Embodiment 1 is that in the CO 2 In the preparation process of high-selectivity molecular sieve, the concentration of KCl solution used is 0.25mol / L, the solid-liquid mass ratio of 4A molecular sieve and KCl solution is 1:5, and the time of ion exchange is 0.5h.
[0060] in CO 2 In the molding process of the high-selectivity molecular sieve, the CO specifically weighed 2 69 parts of high-selectivity molecular sieves, 23 parts of pseudo-boehmite, 2 parts of asparagus powder, 2 parts of citric acid and 4 parts of nitric acid, mixed according to the mass ratio of gouache to powder 3:5. Then, it is extruded with an extruder to obtain an extrudate.
[0061] The extrudates were dried at 120 °C for 2 h and then calcined at 400 °C for 4 h to obtain the final CO 2 Highly selective adsorbent.
[0062] the CO 2 Test results of adsorption capacity of highly selective adsorbents for each gas: for CO 2 The adsorptio...
Example Embodiment
[0064] Example 3
[0065] The difference between this embodiment and Embodiment 1 is that in the CO 2 In the preparation process of high-selectivity molecular sieve, the solid-liquid mass ratio of 4A molecular sieve and KCl solution is 1:5.
[0066] in CO 2 In the molding process of high-selectivity molecular sieve, the specific weighing of CO 2 69 parts of high-selectivity molecular sieves, 23 parts of pseudo-boehmite, 4 parts of asparagus powder and 4 parts of nitric acid are mixed according to the mass ratio of gouache to powder 3:5. Then, it is extruded with an extruder to obtain an extrudate.
[0067] The extrudates were dried at 120 °C for 2 h and then calcined at 550 °C for 4 h to obtain the final CO 2 Highly selective adsorbent.
[0068] the CO 2 Test results of adsorption capacity of highly selective adsorbents for each gas: for CO 2 The adsorption capacity is 47.63 ml / g, the adsorption capacity for CO is 4.74 ml / g, and the adsorption capacity for CH is 47.63 m...
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