Investigation of adsorption/desorption performance by aminopropyltriethoxysilane grafted onto different mesoporous silica for post-combustion CO_(2) capture  

作　　者：Pailin Muchan Chintana Saiwan Manit Nithitanakul 

机构地区：[1]The Petroleum and Petrochemical College,Chulalongkorn University,Soi Chula 12,Phyathai Road,Pathumwan,Bangkok 10330,Thailand [2]Center of Excellence on Petrochemical and Materials Technology,Chulalongkorn University,Bangkok 10330,Thailand

出　　处：《Clean Energy》2020年第2期120-131,共12页清洁能源（英文）

基　　金：financial support from Ratchadaphiseksomphot Endowment Fund,Chulalongkorn University and the Sustainable Petroleum and Petrochemicals Research Unit under the Center of Excellence on the Petrochemical and Materials Technology,Chulalongkorn University.

摘　　要：Mesoporous silicas with hexagonal structure(MCM-41 and SBA-15)and cubical interconnected pore structure(KIT-6)were synthesized and modified with aminopropyltriethoxysilane(APTES)for using as adsorbents in carbon-dioxide(CO_(2))-adsorption application.The CO_(2)-adsorption experiment was carried out at room temperature and atmospheric pressure using 15%CO_(2) with a flow rate of 20 mL/min and the desorption experiment was carried out at 100℃ under N_(2) balance with a flow rate of 20 mL/min.The adsorption capacity and adsorption rate of all modified mesoporous silicas were enhanced due to the presence of primary amine in the structure,which was able to form a fast chemical reaction with CO_(2).All adsorbents showed good adsorption performance stability after using over five adsorption/desorption cycles.Due to the effect of the adsorbents’porous structure on the adsorption/desorption process,an adsorbent with sufficient pore-size diameter and pore volume together with interconnected pore,KIT-6,represents a promising adsorbent that gave the optimum adsorption/desorption performance among others.It showed reasonable adsorption capacity with a high rate of adsorption.In addition,it could also be regenerated with 99.72% efficiency using 12.07 kJ/mmol CO_(2) of heat duty for regeneration.

关 键 词：CO_(2)adsorption mesoporous silica adsorption capacity adsorption rate heat duty for adsorbent regeneration 

分 类 号：O64[理学—物理化学]