The effects of high-pressure on the chemisorption process of CO2 on lithium oxosilicate (Li8SiO6)

被引：23
作者：
Diaz-Herrera, Pablo R. [1 ]
Ramirez-Moreno, Margarita J. [1 ]
Pfeiffer, Heriberto [1 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
来源：
CHEMICAL ENGINEERING JOURNAL | 2015年 / 264卷
关键词：
Lithium silicate; High pressure; CO2; capture; Chemisorption; CARBON-DIOXIDE CAPTURE; HIGH-TEMPERATURE; ADSORPTION; SORPTION; SORBENTS; GAS;
D O I：
10.1016/j.cej.2014.11.057
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
High-pressure CO2 capture was evaluated on Li8SiO6. Several different high-pressure experiments were performed using CO2, and the sample products were analyzed using XRD, N-2 adsorption, SEM and DSC. The results clearly showed that CO2 is chemically and physically trapped and that the CO2 chemisorption improved as a function of temperature. Depending on the temperature, Li8SiO6 reacted with 2 mol or less of CO2 to produce an external shell composed of Li4SiO4, Li2CO3 and Li2O in a non-stoichiometric reaction. Independently of the external shell composition, the final surface area and pore volume increased independent of the external shell composition and favored the second sorption process: CO2 adsorption. Therefore, high pressures enhance CO2 capture between 30 and 350 degrees C, promoting the chemisorption and adsorption processes. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：10 / 15
页数：6
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