Method for adsorbing CO2 in gases
A CO2, gas technology, applied in the field of CO2 adsorption in gas, can solve the problems of low thermal stability, unsatisfactory CO2 removal degree, complicated preparation process of adsorbent, etc., achieving low cost, increased crystallinity, diffusion Low resistance effect
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[0021] Examples 1-3 and Comparative Examples 1-3
[0022] Embodiments 1-3 of the present invention adopt the following methods to control low-concentration CO in gas 2 Adsorption includes the following steps: fill 10g of adsorbent into the middle of a stainless steel tube with an inner diameter of 20mm and a length of 400mm, and the rest is filled with ceramic sheets. The adsorbent is at 350℃ and the space velocity is 100h. -1 Of N 2 Activated in the air for 5h, then the temperature is reduced to 25℃, under normal pressure, for 100h -1 Space velocity, from the top of the adsorption fixed bed with low concentration CO containing 1000ppmv 2 The gas after adsorption is analyzed by helium ion detector gas chromatograph for CO 2 Content until the adsorption reaches saturation. Take CO in outlet gas 2 When the content reaches 1ppmv, the penetration point is calculated. 2 The penetration adsorption capacity and saturation adsorption capacity.
[0023] The other conditions of Comparative Ex...
Example Embodiment
[0027] Example 4-7
[0028] The other conditions of Examples 4-7 are the same as those of Examples 1-3, except that the adsorbent is changed to LiZSM-5 molecular sieve, and the adsorption temperatures are 5°C, 25°C, 50°C and 75°C, respectively. The results are shown in Table 2.
[0029] Table 2 Adsorption temperature of LiZSM-5 molecular sieve for CO adsorption 2 Performance impact
[0030]
[0031] It can be seen from Examples 4-7 that as the adsorption temperature increases, CO 2 Penetration adsorption capacity and CO 2 The saturated adsorption capacity is significantly reduced. It can be seen that the increase of the adsorption temperature greatly reduces the CO 2 Penetration adsorption capacity and CO 2 The saturated adsorption capacity is not conducive to maximizing the adsorption performance of the adsorbent. It can be seen from Examples 4-7 that when the adsorption temperature in Example 4 is 5°C, CO 2 Penetration adsorption capacity and CO 2 The saturated adsorption capacity r...
Example Embodiment
[0032] Example 8-10
[0033] The other conditions of Examples 8-10 are the same as those of Examples 1-3, except that the adsorbent is changed to LiZSM-5 molecular sieve, N 2 / CO 2 The mixed gas feed space velocity is 100h respectively -1 , 400h -1 , 600h -1 , The results are shown in Table 3.
[0034] Table 3 Adsorption of CO on LiZSM-5 molecular sieve by feed space velocity 2 Performance impact
[0035]
[0036] It can be seen from Examples 8-10 that with N 2 / CO 2 The increase in air velocity of mixed gas feed, CO 2 Penetration adsorption capacity and CO 2 The saturated adsorption capacity decreases accordingly, and N in Example 8 2 / CO 2 The mixed gas feed space velocity is 100 -1 , At this time CO 2 Penetration adsorption capacity and CO2 saturated adsorption capacity are the largest, LiZSM-5 molecular sieve adsorbs CO 2 Best performance, too fast sample space velocity will cause CO 2 The contact time with the molecular sieve is reduced, thereby reducing the adsorption efficiency...
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