Development of synthetic CaO sorbents via CTAB-assisted sol-gel method for CO2 capture at high temperature

被引:110
作者
Akgsornpeak, Akarat [1 ]
Witoon, Thongthai [1 ,2 ,3 ,4 ,5 ]
Mungcharoen, Thumrongrut [1 ]
Limtrakul, Jumras [2 ,3 ,4 ,5 ]
机构
[1] Kasetsart Univ, Fac Engn, Dept Chem Engn, Natl Ctr Excellence Petr Petrochem & Adv Mat, Bangkok 10900, Thailand
[2] Kasetsart Univ, Ctr Adv Studies Nanotechnol & Its Applicat Chem F, Bangkok 10900, Thailand
[3] Kasetsart Univ, Dept Chem, Bangkok 10900, Thailand
[4] Kasetsart Univ, NANOTEC Ctr Nanoscale Mat Design Green Nanotechno, Bangkok 10900, Thailand
[5] PTT Publ Co Ltd, PTT Grp Frontier Res Ctr, Bangkok 10900, Thailand
关键词
CO2; adsorption; Sol-gel process; Calcium oxide; Nanostructures; CALCIUM-BASED SORBENTS; CARBON-DIOXIDE; LOOPING CYCLE; REACTIVATION; CAPACITY;
D O I
10.1016/j.cej.2013.10.023
中图分类号
X [环境科学、安全科学];
学科分类号
083001 [环境科学];
摘要
The use of calcium oxide (CaO) for the CO2 looping cycle has attracted increased attention due to several potential advantages. The main drawback of this cycle in practical applications is a sharp decay subsequent to a few cycles of carbonation-calcination. In this work, we report the development of synthetic CaO sorbents via a sot-gel method. Effect of Ca2+/CTAB molar ratios on physical properties of the CaO sorbents as well as their CO2 capture performance were investigated. The presence of CTAB was found to effectively prevent an agglomeration of CaO particles, and to greatly increase BET surface area and total pore volume of the resulting CaO sorbents. Volcano-shaped trends in the BET surface area and total pore volume with respect to the increase of CTAB concentration signal an optimum Ca2+/CTAB ratio. The CaO sorbent prepared with the Ca2+/CTAB molar ratio of 10:3 achieves the highest carbonation conversion of 76.55% in the first cycle, and retains an excellent carbonation conversion of 63.28% subsequent to 20 consecutive test cycles. Furthermore, the analysis results suggest the presence of two linear relationships between: carbonation conversion at reaction stage and BET surface area, and carbonation conversion at diffusion stage and CaO crystallite size. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:189 / 198
页数:10
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