湿法再生吸附剂制备及用于大气CO_2的直接捕集

Preparation of moisture swing adsorbent and performance test for CO_2 capture from ambient air

基于湿法再生吸附技术,利用强碱性季铵盐树脂材料制备了异相吸附剂薄膜,应用于大气中极低CO2的直接分离,以对抗全球变暖。通过滴定法分析吸附剂材料的电荷密度和吸附容量,利用SEM分析不同工况下制备出来的膜材料的表观结构,并对膜材料进行CO2吸附性能的测试。结果发现,热处理能够明显提高膜材料的吸附性能,还研究吸附剂制备对吸附速率,吸附量和机械强度等性能的影响,发现粒径小于43μm的树脂粉末,按60%质量分数制成的500μm厚膜材料具有较优的综合性能。

The moisture swing adsorption is an emerging technology for carbon dioxide separation. A mois- ture swing adsorbent, as the form of heterogeneous membrane, was prepared with strong based quaternary ammoni- um resin for direct CO2 capture from ambient air. The charge density and the adsorption capacity of the adsorbent were analyzed through titration method. The apparent structures of the membranes made under different conditions were observed by SEM. Adsorption experiments were conducted to study the performance of carbon dioxide ad- sorption. The results indicate that the heat treatment can improve obviously the adsorption performance of the ad- sorbent membrane. The effect of adsorbent preparation on adsorption velocity, adsorption capacity and mechanical property of membrane was studied. The adsorbent membrane with resin powder under 43μm,60% absorbent mass fraction and 500 μm thickness shows an optimized performance.