Carbonation kinetics of CO2 with CaO-Ca9Al6O18 sorbent

XIE Miaomiao; ZHOU Zhiming; QI Yang; CHENG Zhenmin

doi:10.3969/j.issn.0438-1157.2013.02.017

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Carbonation kinetics of CO₂ with CaO-Ca₉Al₆O₁₈ sorbent

更新时间：2025-12-10

- Carbonation kinetics of CO₂ with CaO-Ca₉Al₆O₁₈ sorbent
- CIESC Journal Issue 2, Pages: 532-538(2013)
- 作者机构：
  
  华东理工大学, 化学工程联合国家重点实验室,上海,200237
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2013.02.017
  CLC： Q530TQ037
- Online First：05 February 2013，
  
  Published：05 February 2013
- 稿件说明：
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XIE Miaomiao, ZHOU Zhiming, QI Yang, et al. Carbonation kinetics of CO₂ with CaO-Ca₉Al₆O₁₈ sorbent[J]. CIESC Journal, 2013, (2): 532-538. DOI: 10.3969/j.issn.0438-1157.2013.02.017.
DOI：

XIE Miaomiao, ZHOU Zhiming, QI Yang, et al. Carbonation kinetics of CO₂ with CaO-Ca₉Al₆O₁₈ sorbent[J]. CIESC Journal, 2013, (2): 532-538. DOI: 10.3969/j.issn.0438-1157.2013.02.017. DOI：

摘要

以柠檬酸钙和硝酸铝为前体

采用湿法混合法制备了CaO质量分数为80%的CaO-Ca9Al6O18吸收剂

并对其CO2吸收性能进行了研究。结果表明

CaO-Ca9Al6O18具有优异的CO2吸收容量和长周期循环使用稳定性

经过50次循环使用后

其转化率仍保持在78%以上

远优于传统的CaO吸收剂。在500～700℃和CO2分压为0.005～0.015 MPa条件下

研究了CaO-Ca9Al6O18吸收剂的碳酸化反应动力学

分别采用离子反应模型和表观模型描述化学反应动力学控制阶段(快反应段)和产物层扩散阶段(慢反应段)。实验测得的吸收剂转化率与模型预测值吻合较好

快慢反应段的活化能分别为25.6、57.7 kJ·mol-1。该动力学模型可准确模拟CaO-Ca9Al6O18吸收剂在长周期循环使用条件下的碳酸化反应。

Abstract

A CaO-Ca9Al6O18 sorbent with a mass fraction of CaO of 80% was prepared by the wet mixing method.Calcium citrate and aluminum nitrate were used as calcium and aluminum precursors

respectively. The CO2 capture performance of the sorbent was investigated by using thermogravimetry.The results showed that the CaO-Ca9Al6O18 sorbent exhibited excellent CO2 capture capacity and long-term cyclic stability

and its conversion remained above 77% after 50 consecutive cyclic operations

which was much better than that of conventional CaO sorbent.The carbonation kinetics between CO2 and the CaO-Ca9Al6O18 sorbent was then studied over a temperature range of 500—700℃ and CO2 partial pressure of 0.005—0.015 MPa.The fast reaction regime (controlled by chemical reaction) and the slow reaction regime (controlled by diffusion) of the carbonation reaction were successfully described by an ion reaction model and an apparent model

respectively

and the corresponding activation energies were 25.6 kJ·mol-1 and 57.7 kJ·mol-1

respectively.The predicted conversions of the CaO-Ca9Al6O18 sorbent agreed well with the experimental data.Finally

the kinetic model established was successfully used to predict the carbonation reaction of long-term cyclic operation.

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