Elevated temperature CO2 capture on nano-structured MgO-Al2O3 aerogel: Effect of Mg/Al molar ratio

被引：92

作者：

Han, Seung Ju ^{[1
]}

Bang, Yongju ^{[1
]}

Kwon, Hyuk Jae ^{[2
]}

Lee, Hyun Chul ^{[2
]}

Hiremath, Vishwanath ^{[3
]}

Song, In Kyu ^{[1
]}

Seo, Jeong Gil ^{[3
,4
]}

机构：

[1] Seoul Natl Univ, Inst Chem Proc, Sch Chem & Biol Engn, Seoul 151744, South Korea

[2] Samsung Adv Inst Technol, Energy Lab, Yongin 446712, Gyeonggi Do, South Korea

[3] Myongji Univ, Dept Energy & Biotechnol, Yongin 449728, Gyeonggi Do, South Korea

[4] Myongji Univ, Dept Environm Engn & Energy, Yongin 449728, Gyeonggi Do, South Korea

来源：

CHEMICAL ENGINEERING JOURNAL | 2014年 / 242卷

基金：

新加坡国家研究基金会;

关键词：

Elevated temperature CO2 capture; Nano-structured Adsorbent; MgO-Al2O3; Aerogel; Basicity; CARBON-DIOXIDE; HYDROTHERMAL SYNTHESIS; CATALYST SUPPORTS; MIXED OXIDES; MGO; HYDROTALCITE; MAGNESIUM; SORBENT; SORPTION; ALUMINA;

D O I：

10.1016/j.cej.2013.12.092

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Nano-structured MgO-Al2O3 aerogel adsorbents (denoted as MgAl-AE-X) with different Mg/Al molar ratio (X) were prepared by a single-step epoxide-driven sol-gel method and a subsequent CO2 supercritical drying method. The effect of Mg/Al molar ratio of nano-structured MgO-Al2O3 aerogel adsorbents on their physicochemical properties and CO2 adsorptive performance at elevated temperature (200 degrees C) was investigated. Successful formation of flower-like nano-structured MgAl-AE-X adsorbents was confirmed by N-2 adsorption-desorption isotherms and SEM analyses. The crystalline structure of MgAl-AE-X adsorbents was transformed in the sequence of Al2O3 -> MgAl2O4 -> MgO-MgAl2O4 with increasing Mg/Al molar ratio from 0 to 3. All the MgAl-AE-X adsorbents were found to possess weak base site and medium base site except for strong base site. In the dynamic CO2 adsorption, both the total CO2 capacity and the 90% breakthrough CO2 capacity showed volcano-shaped curves with respect to Mg/Al molar ratio, and they were decreased in the order of MgAl-AE-0.5 > MgAl-AE-1.0 > MgAl-AE-2.0 > MgAl-AE-3.0 > MgAl-AE-0. It was found that the 90% breakthrough CO2 capacity increased with increasing medium basicity of the adsorbents. Among the adsorbents tested, MgAl-AE-0.5 (Mg/Al = 0.5) adsorbent with the highest medium basicity showed the best CO2 adsorptive performance. Thus, medium basicity of nano-structured MgO-Al2O3 aerogel adsorbents served as a crucial factor in determining CO2 adsorptive performance at elevated flue gas temperature (200 degrees C). (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：357 / 363

页数：7

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