Comparison study on strategies to prepare nanocrystalline Li2ZrO3-based absorbents for CO2 capture at high temperatures

doi:10.1007/s11705-013-1346-1

Front Chem Sci Eng

2013, Vol. 7

Issue (3) : 297-302 https://doi.org/10.1007/s11705-013-1346-1

RESEARCH ARTICLE

Comparison study on strategies to prepare nanocrystalline Li₂ZrO₃-based absorbents for CO₂ capture at high temperatures

Qiang XIAO, Xiaodan TANG, Yefeng LIU, Yijun ZHONG, Weidong ZHU(

)

Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China

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Abstract

A comparison study has been conducted on the strategies for synthesizing nanocrystalline Li₂ZrO₃ and K-doped Li₂ZrO₃ absorbents for CO₂ capture at high temperatures, including solid-state and liquid-phase methods, citrate route, and starch-assisted sol-gel method combined with freeze-drying technique. The absorption properties, including uptake rate and absorption capacity, of synthesized absorbents were investigated by thermogravimetric analysis (TGA) at different CO₂ partial pressures. The nanosized Li₂ZrO₃ crystals synthesized by the citrate route exhibit a faster uptake and a higher, nearly stoichiometric absorption capacity than those synthesized by the solid-state and liquid-phase methods. The doping of K into Li₂ZrO₃ can significantly improve the uptake rate of CO₂, especially at low CO₂ partial pressures. For the synthesis of K-doped Li₂ZrO₃, the citrate route has poor reproducibility and scalability, whereas the starch-assisted sol-gel method combined with freeze-drying technique is reproducible and easily scaled up, and the thus synthesized absorbents possess excellent CO₂ capture properties.

Keywords CO₂ capture Li₂ZrO₃ K-doped Li₂ZrO₃ citrate starch freeze-drying technique

Corresponding Author(s): ZHU Weidong,Email:weidongzhu@zjnu.cn

Issue Date: 05 September 2013

Cite this article:

Qiang XIAO,Xiaodan TANG,Yefeng LIU, et al. Comparison study on strategies to prepare nanocrystalline Li₂ZrO₃-based absorbents for CO₂ capture at high temperatures[J]. Front Chem Sci Eng, 2013, 7(3): 297-302.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-013-1346-1
https://academic.hep.com.cn/fcse/EN/Y2013/V7/I3/297

Fig.1 Uptake profiles of CO in the LiZrO absorbents synthesized by the citrate route (a) at 823 K, the liquid-phase method; (b) at 887 K, the solid-state method; (c) at 773 K, at a CO partial pressure of 0.5 bar for all

Fig.2 Block diagrams of the citrate route and the liquid-phase method for the synthesis of LiZrO absorbents

Fig.3 Uptake profiles of CO in K-doped LiZrO (a, c) and LiZrO (b, d) synthesized via the citrate route at 823 K and a CO partial pressure of 0.25 bar for (a) and (b) while 1.0 bar for (c) and (d)

Fig.4 Block diagram of the starch-assisted sol-gel method combined with freeze-drying technique for the preparation of K-doped LiZrO

Fig.5 Uptake profiles of CO in K-doped LiZrO prepared by (a) the starch-assisted sol-gel method combined with freeze-drying technique, (b) the liquid-phase method [], and (c) the solid-state method [] as well as (d) in LiZrO prepared by the citrate route. Absorption conditions: (a) and (d) at 823 K and a CO partial pressure of 0.25 bar, (b) at 848 K and a CO partial pressure of 0.30 bar, and (c) at 823 K and a CO partial pressure of 1.0 bar

Fig.6 XRD patterns of LiZrO prepared by (a) the liquid-phase method and (b) the citrate route as well as (c) of K-doped LiZrO prepared by the citrate route and (d) the starch-assisted sol-gel method combined with freeze-drying technique

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