硅胶的二氧化碳吸附性能及其与微孔结构的关系

Relationship Between Microstructure of Silicon Gel and Its Adsorptive Performance of Carbon Dioxide

实验测定了CO2、N2在两种硅胶上的吸附平衡数据,用柱动态法研究了硅胶吸附剂在CO2/N2和CO2/H2体系中对CO2的动态吸附性能,比较了两种硅胶吸附剂吸附穿透曲线和吸附性能的差异,并研究硅胶的微结构特性对吸附二氧化碳性能的影响。结果表明:比表面大、孔径分布趋向细孔有利于硅胶对二氧化碳的吸附,而适当的孔分布则有利于硅胶吸附剂减小扩散阻力。研究结果为硅胶吸附剂的改进以及变压吸附在合成气脱碳过程中的应用提供了依据。

The adsorption equilibrium data of N_2 and CO_2 on two kinds of silicon gel were measured. The dynamic adsorption characteristics of CO_2 in gas mixtures, CO_2/N_2 and CO_2/H_2, were also studied. A comparison of breakthrough curves and adsorbed amount of CO_2 on two adsorbents was made, and the effect of the microstructure on the adsorption of CO_2 was researched and found that the large surface area and the micropore inside silicon gel were favorable to the adsorption of CO_2. The appropriate distribution of bore diameter was beneficial to reduce the diffusion resistance of silicon gel. The results of this paper offered a method for improving the silicon gel adsorbents and applying them in pressure swing adsorptive (PSA) process of removing CO_2 from synthesis gas.