Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

doi:10.1016/j.cjche.2017.05.016

›› 2017, Vol. 25 ›› Issue (10): 1412-1421.DOI: 10.1016/j.cjche.2017.05.016

• Separation Science and Engineering • Previous Articles Next Articles

Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

Xiaotong Liu^1,2,3,4, Xiaoxun Ma^1,2,3,4, Liu He^1,2,3,4, Shisen Xu⁵

1 School of Chemical Engineering, Northwest University, Xi'an 710069, China;
2 Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi'an 710069, China;
3 Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an 710069, China;
4 International Scientific and Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources, Xi'an 710069, China;
5 China Huaneng Group Clean Energy Technology Research Institute, Beijing 100098, China

Received:2017-02-23 Revised:2017-05-22 Online:2017-07-04 Published:2017-10-28
Supported by:
Supported by Capture CO₂ and Storage Technology Jointly Studied by USA and China (2013DFB60140-04), and Key Program of National Natural Science Foundation of China (No. 21536009).

Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

Xiaotong Liu^1,2,3,4, Xiaoxun Ma^1,2,3,4, Liu He^1,2,3,4, Shisen Xu⁵

1 School of Chemical Engineering, Northwest University, Xi'an 710069, China;
2 Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy, Xi'an 710069, China;
3 Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an 710069, China;
4 International Scientific and Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources, Xi'an 710069, China;
5 China Huaneng Group Clean Energy Technology Research Institute, Beijing 100098, China

通讯作者: Xiaoxun Ma,E-mail address:maxym@nwu.edu.cn
基金资助:
Supported by Capture CO₂ and Storage Technology Jointly Studied by USA and China (2013DFB60140-04), and Key Program of National Natural Science Foundation of China (No. 21536009).

Abstract

Abstract: In the present work, the effect of pre-calcination on carbonation conversion and cyclic stability of modified CaObased sorbent was investigated by thermogravimetric analyzer (TGA). The modified CaO-based sorbents with CaAc₂ as precursor were respectively doped with different elements (Mg, Al, Ce, Zr and La). The specific surface area, pore volume and pore size distribution were tested by N₂ isothermal adsorption measurements. The phase compositions of sorbents were characterized by X-ray diffraction (XRD). The results showed that the cyclic stabilities of the sorbents were improved by pre-calcination. The pre-calcination was conducted at 900℃ for 5 h in air by the muffle furnace. With pre-calcination, the cyclic stabilities of sorbents could be as high as 96% after 22 cycles, such as CaO-Al, CaO-Ce and CaO-La. After contact with air, the carbonation conversions of spent sorbents with pre-calcination suddenly increased by about one-sixth due to the change of channel structure by hydration. Both the cyclic stability of sorbent and the durability of reactivation were related to the structural stability of sample, especially the stability of mesopores between 2 nm and 5.5 nm. The present work also provided an easy and low-cost method for reactivating the spent CaO-based sorbents.

Key words: CaO-based sorbent, Cyclic stability, Pre-calcination, Reactivation

摘要： In the present work, the effect of pre-calcination on carbonation conversion and cyclic stability of modified CaObased sorbent was investigated by thermogravimetric analyzer (TGA). The modified CaO-based sorbents with CaAc₂ as precursor were respectively doped with different elements (Mg, Al, Ce, Zr and La). The specific surface area, pore volume and pore size distribution were tested by N₂ isothermal adsorption measurements. The phase compositions of sorbents were characterized by X-ray diffraction (XRD). The results showed that the cyclic stabilities of the sorbents were improved by pre-calcination. The pre-calcination was conducted at 900℃ for 5 h in air by the muffle furnace. With pre-calcination, the cyclic stabilities of sorbents could be as high as 96% after 22 cycles, such as CaO-Al, CaO-Ce and CaO-La. After contact with air, the carbonation conversions of spent sorbents with pre-calcination suddenly increased by about one-sixth due to the change of channel structure by hydration. Both the cyclic stability of sorbent and the durability of reactivation were related to the structural stability of sample, especially the stability of mesopores between 2 nm and 5.5 nm. The present work also provided an easy and low-cost method for reactivating the spent CaO-based sorbents.

关键词: CaO-based sorbent, Cyclic stability, Pre-calcination, Reactivation

Xiaotong Liu, Xiaoxun Ma, Liu He, Shisen Xu. Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles[J]. , 2017, 25(10): 1412-1421.

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Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles

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