沸石负载钾基吸收剂再生试验研究

Experimental Study on Regeneration of Potassium-based/13X Zeolite Molecular Sieves Supported Sorbent for CO_2 Capture

介绍了13X沸石分子筛负载钾基CO_2吸收剂的制备方法,通过扫描电镜分析其微观结构,采用热重分析方法研究其再生反应特性。考察了不同反应终温和升温速率对再生反应特性的影响规律,并采用热分析动力学方法求取了再生反应特性参数。结果表明,KHCO_3负载于沸石分子筛上之后,改善了吸收剂的表观结构,有利于反应进行;分解终温增大能提高反应速率,但高于200℃之后,效果不明显;升温速率低于15℃/min时对再生反应影响显著,但超过15℃/min后影响减弱;吸收剂再生反应表观活化能为41.09-45.60 k J/mol,当升温速率为10℃/min时,所需活化能最小,为41.09 k J/mol,反应最易进行。

The preparation method of potassium-based/13 X zeolite molecular sieves supported sorbent was introduced,and the microstructure of this sorbent was analyzed with scanning electron microscopy（SEM）. Thermogravimetric analysis was used to study the regeneration characteristics, and the effect of different final temperatures and heating rates on the regeneration reaction was also studied. The kinetic parameters of decomposition reaction were calculated by thermal analysis method. Results showed that adding KHCO_3 on 13X zeolite molecular sieves can change the microstructure which can benefit the reaction. High final temperature of regeneration can increase the reaction rate,but the effect becomes weak at the temperature higher than 200 ℃. Besides,heating rate has significant effect on the regenerative response while it is less than 15 ℃ /min. Activation energy of regeneration reaction ranges from 41.09 k J/mol to 45.60 k J/mol,and the sorbent can decompose readily at heating rate of 10 ℃/min,in this case,the activation energy is the least.