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首页> 外文期刊>Separation and Purification Technology >Adsorption equilibria and kinetics of silica gel for N2O, O-2, N-2, and CO2
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Adsorption equilibria and kinetics of silica gel for N2O, O-2, N-2, and CO2

机译：N2O，O-2，N-2和CO2的吸附平衡和硅胶动力学

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摘要

To gain insights into N2O recovery from industrial effluent, adsorption equilibria and kinetics of N2O, O-2, N-2, and CO2 on silica gels were evaluated at 293, 308, and 323 K under pressures of up to 1000 kPa using a volumetric method. Adsorption characteristics of the adsorbates on silica gel were compared with those on activated carbon. Adsorption isotherms indicated lower adsorption amounts for all of the adsorbates on silica gel, compared to those on activated carbon; both materials adsorbed higher amounts of N2O and CO2 than O-2 and N-2. In the case of silica gel, CO2 was adsorbed more strongly than N2O, while activated carbon exhibited the opposite. The experimental uptake on silica gel was well fitted by the non-isothermal diffusion model. The adsorption rate on silica gel was slower than that on activated carbon for all the adsorbates, while the order of adsorption rate was the same: N-2 > O-2 N2O >= CO2. The uptake results of N2O on varying sizes of silica gel indicated that macropore diffusion significantly affected adsorption on silica gel, which was not the case for activated carbon. The adsorption characteristics of N2O and CO2 on silica gel were distinct from those on activated carbon, due to the inherent electrical properties and molecular structural interactions of the adsorbent and adsorbates.
机译：为了从工业污水中获得N2O回收，在293,308和323K使用体积的压力下评估在工业污水中，吸附平衡和N 2 O-2，N-2和CO 2的吸附平衡和CO 2和CO2的硅胶的助理剂。方法。将吸附剂对硅胶上的吸附特性与活性炭上的吸附特性进行比较。与活性炭相比，吸附等温物针对硅胶上的所有吸附物的吸附量较低;两种材料吸附着较高量的N2O和CO 2而不是O-2和N-2。在硅胶的情况下，CO 2比N2O更强烈地吸附，而活性炭表现出相反的。非等温扩散模型硅胶上的实验摄取良好。硅胶上的吸附速率比所有吸附剂的活性炭较慢，而吸附速率的顺序相同：N-2> O-2 N 2 O> = CO 2。 N2O对不同尺寸的硅胶尺寸的摄取结果表明，大孔扩散显着影响硅胶上的吸附，这不是活性炭的情况。由于吸附剂和吸附剂的固有电性能和分子结构相互作用，N 2 O和CO 2对硅胶上的吸附特性与活性炭不同。

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