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

Xiaotong Liu; Xiaoxun Ma; Liu He; Shisen Xu

doi:10.1016/j.cjche.2017.05.016

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

Separation Science and Engineering | Updated：2026-01-06

- Effect of pre-calcination for modified CaO-based sorbents on multiple carbonation/calcination cycles
- Chinese Journal of Chemical Engineering Vol. 25, Issue 10, Pages: 1412-1421(2017)
- Affiliations：
  
  1. School of Chemical Engineering, Northwest University,Xi'an,China,710069
  2. Chemical Engineering Research Center of the Ministry of Education for Advanced Use Technology of Shanbei Energy,Xi'an,China,710069
  3. Shaanxi Research Center of Engineering Technology for Clean Coal Conversion,Xi'an,China,710069
  4. International Scientific and Technological Cooperation Base for Clean Utilization of Hydrocarbon Resources,Xi'an,China,710069
  5. China Huaneng Group Clean Energy Technology Research Institute,Beijing,China,100098
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.05.016
  CLC：
- Published：2017
- Accepted：
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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.
DOI：

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. DOI： 10.1016/j.cjche.2017.05.016.

摘要

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 CaAc

as precursor were respectively doped with different elements (Mg

Zr and La). The specific surface area

pore volume and pore size distribution were tested by N

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.

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