Effect of TiO2 dopant on CO2 capture performance of Na2CO3/Al2O3

DONG Wei; CHEN Xiaoping; WU Ye

doi:10.3969/j.issn.0438-1157.2014.09.042

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Effect of TiO₂ dopant on CO₂ capture performance of Na₂CO₃/Al₂O₃

更新时间：2025-12-10

- Effect of TiO₂ dopant on CO₂ capture performance of Na₂CO₃/Al₂O₃
- CIESC Journal Issue 9, Pages: 3617-3625(2014)
- 作者机构：
  
  能源热转换及其过程测控教育部重点实验室, 东南大学能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.09.042
  CLC： K09
- Online First：05 September 2014，
  
  Published：05 September 2014
- 稿件说明：
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DONG Wei, CHEN Xiaoping, WU Ye. Effect of TiO₂ dopant on CO₂ capture performance of Na₂CO₃/Al₂O₃[J]. CIESC Journal, 2014, (9): 3617-3625. DOI: 10.3969/j.issn.0438-1157.2014.09.042.
DOI：

DONG Wei, CHEN Xiaoping, WU Ye. Effect of TiO₂ dopant on CO₂ capture performance of Na₂CO₃/Al₂O₃[J]. CIESC Journal, 2014, (9): 3617-3625. DOI: 10.3969/j.issn.0438-1157.2014.09.042. DOI：

摘要

钠基固体吸收剂脱除燃煤烟气CO2技术具有反应温度低、能耗低等优点，日益受到学术界的关注。该技术的主要不足是吸收剂的活性成分碳酸钠与CO2的反应（碳酸化反应）活性较低。针对这一问题，本文旨在研制一种新型改性钠基固体吸收剂，采用活性氧化铝作为载体、TiO2作为掺杂剂进行改性，利用热重分析装置、XRD、SEM和氮吸附仪研究钠基固体吸收剂的CO2捕捉性能。结果表明：掺杂TiO2后，钠基固体吸收剂与CO2的反应速率加快，CO2捕捉量增加；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；然而TiO2掺杂过多会堵塞吸收剂的微观孔道，不利于甚至阻碍碳酸化反应的进行，因此，TiO2的掺杂量应控制在一定的范围内。

Abstract

The control of CO2 emission by using sodium-based solid sorbents is receiving attention increasingly because of low reaction temperature and low energy consumption. However

there is a primary drawback for it

i.e. low reactivity with CO2 during sorption process. So

a modified sodium-based solid sorbent

Na2CO3/NaHCO3 supported on alumina and modified by TiO2

was proposed for CO2 capture and characterized by SEM

XRD and TG. The results indicate that TiO2 is stable in whole range of operation temperature of capturing CO2 process and after use there is no formation of Ti compounds except TiO2. More importantly

after dopping TiO2 the CO2 capacity of the sorbent increases and its reaction rate with CO2 goes also up. The reaction products are NaHCO3 and Na5H3(CO3)4. However if too much TiO2 was doped

block of sorbent microstructure could take place

leading to unfavourable effect on the CO2 capture process.

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