[1] Dong Wei, Chen Xiaoping, Yu Fan,. CO2 capture using dry TiO2-doped Na2CO3/Al2O3 sorbentsin a fluidized-bed reactor [J]. Journal of Southeast University (English Edition), 2015, 31 (2): 220-225. [doi:10.3969/j.issn.1003-7985.2015.02.011]

Copy

CO₂ capture using dry TiO₂-doped Na₂CO₃/Al₂O₃ sorbentsin a fluidized-bed reactor()

TiO₂掺杂Na₂CO₃/Al₂O₃吸收剂在流化床中的CO₂捕集特性

Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

31

Issue:

2015 2

Page:

220-225

Research Field:

Energy and Power Engineering

Publishing date:

2015-06-20

Info

Title:

CO₂ capture using dry TiO₂-doped Na₂CO₃/Al₂O₃ sorbentsin a fluidized-bed reactor

TiO₂掺杂Na₂CO₃/Al₂O₃吸收剂在流化床中的CO₂捕集特性

Author(s):

Dong Wei, Chen Xiaoping, Yu Fan

Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, Southeast University, Nanjing 210096, China

董伟, 陈晓平, 余帆

东南大学能源热转换及其过程测控教育部重点实验室, 南京 210096

Keywords:

CO₂ capture;  Na₂CO₃/Al₂O₃;  TiO₂;  fluidized-bed test

CO₂捕集;  Na₂CO₃/Al₂O₃;  TiO₂;  流化床试验

PACS:

TK09

DOI:

10.3969/j.issn.1003-7985.2015.02.011

Abstract:

In order to improve the reactivity of Na₂CO₃/Al₂O₃ sorbent with CO₂, a new sorbent showing high reactivity was developed by doping Na₂CO₃/Al₂O₃ with TiO₂ using impregnation. Fourteen multi-cycle carbonation/regeneration tests of the sorbent were carried out in a fluidized-bed reactor and the sorbent was characterized by X-ray diffraction and nitrogen adsorption. It is confirmed that TiO₂ shows a positive effect on the adsorption process of Na₂CO₃ and the reaction rate is observed to increase significantly, especially in the first 10 min. Moreover, TiO₂ is stable within the temperature range of the process and no other Ti-compounds are detected. The carbonation products are NaHCO₃ and Na₅H₃(CO₃)₄. The surface area and the pore volume of the sorbent keep stable after 14 cycles. The Fourier transform infrared spectroscopy and the X-ray photoelectron spectroscopy are used to analyze the effect mechanism of TiO₂ on CO₂ adsorption process of Na₂CO₃/Al₂O₃.

由于Na₂CO₃/Al₂O₃吸收剂的活性成分Na₂CO₃与CO₂反应活性较低, 选用TiO₂作为掺杂剂, 采用浸渍法将其添加到Na₂CO₃/Al₂O₃吸收剂中进行改性, 研制一种新型具有高反应活性的钠基固体吸收剂.利用小型流化床反应器进行了14次循环脱碳/再生试验, 并对吸收剂进行了XRD和氮吸附表征.结果表明:掺杂TiO₂后, 吸收剂与CO₂的反应速率加快, 特别是在碳酸化反应的前10 min内;反应前后除TiO₂外无其他含Ti化合物生成;碳酸化反应产物为NaHCO₃和Na₅H₃(CO₃)₄;14次循环反应后吸收剂仍保持稳定的微观结构.采用XPS和FTIR分析了TiO₂对Na₂CO₃/Al₂O₃吸收剂脱碳特性的改性机理.

References:

[1] Lee S C, Choi B Y, Lee T J, et al. CO₂ absorption and regeneration of alkali metal-based solid sorbents [J]. Catalysis Today, 2006, 111(3/4): 385-390.
[2] Lee S C, Chae H J, Lee S J, et al. Novel regenerable potassium-based dry sorbents for CO₂ capture at low temperatures [J]. Journal of Molecular Catalysis B: Enzymatic, 2009, 56(2/3): 179-184.
[3] Zhao C, Chen X, Zhao C, et al. K₂CO₃/Al₂O₃ for capturing CO₂ in flue gas from power plants. Part 3: CO₂ capture behaviors of K₂CO₃/Al₂O₃ in a bubbling fluidized-bed reactor [J]. Energy & Fuels, 2012, 26(5): 3062-3068.
[4] Zhao C, Chen X, Zhao C. K₂CO₃/Al₂O₃ for capturing CO₂ in flue gas from power plants. Part 1: Carbonation behaviors of K₂CO₃/Al₂O₃ [J]. Energy & Fuels, 2012, 26(2): 1401-1405.
[5] Lee S C, Kim J C. Dry potassium-based sorbents for CO₂ capture [J]. Catalysis Surveys from Asia, 2007, 11(4): 171-185.
[6] Dong W, Chen X, Wu Y, et al. Carbonation characteristics of dry sodium-based sorbents for CO₂ capture [J]. Energy & Fuels, 2012, 26(9): 6040-6046.
[7] Chen H, Zhao C, Yu W. Calcium-based sorbent doped with attapulgite for CO₂ capture [J]. Applied Energy, 2013, 112: 67-74.
[8] Sun R, Li Y, Liu H, et al. CO₂ capture performance of calcium-based sorbent doped with manganese salts during calcium looping cycle [J]. Applied Energy, 2012, 89(1): 368-373.
[9] Al-Jeboori M J, Fennell P S, Nguyen M, et al. Effects of different dopants and doping procedures on the reactivity of CaO-based sorbents for CO₂ capture [J]. Energy & Fuels, 2012, 26(11): 6584-6594.
[10] Dong W, Chen X, Wu Y. Effect of TiO₂ dopant on CO₂ capture performance of Na₂CO₃/Al₂O₃ [J]. CIESC Journal, 2014, 65(9): 3618-3625.(in Chinese)
[11] Dong W, Chen X, Wu Y. TiO₂-doped K₂CO₃/Al₂O₃ sorbents for CO₂ capture [J]. Energy & Fuels, 2014, 28(5): 3310-3316.
[12] Nagarkar P V, Searson P C, Gealy F D. Effect of surface treatment on SrTiO₃: an X-ray photoelectron spectroscopic study [J]. Journal of Applied Physics, 1991, 69(1): 459-462.
[13] Takeuchi M, Martra G, Coluccia S, et al. Investigations of the structure of H₂O clusters adsorbed on TiO₂ surfaces by near-infrared absorption spectroscopy [J]. The Journal of Physical Chemistry B, 2005, 109(15): 7387-7391.

Memo

Memo:

Biographies: Dong Wei(1986—), male, graduate; Chen Xiaoping(corresponding author), male, doctor, professor, xpchen@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.51476030), the Specialized Research Fund for the Doctoral Program of Higher Education(No.20130092110006).
Citation: Dong Wei, Chen Xiaoping, Yu Fan. CO₂ capture using dry TiO₂-doped Na₂CO₃/Al₂O₃ sorbents in a fluidized-bed reactor[J].Journal of Southeast University(English Edition), 2015, 31(2):220-225.[doi:10.3969/j.issn.1003-7985.2015.02.011]

Common functions