CO2 capture by double metal modified CaO-based sorbents from pyrolysis gases

doi:10.1016/j.cjche.2021.09.002

中国化学工程学报 ›› 2022, Vol. 43 ›› Issue (3): 40-49.DOI: 10.1016/j.cjche.2021.09.002

CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma

School of Electric Power, South China University of Technology, Guangzhou 510640, China;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510640, China

收稿日期:2021-07-05 修回日期:2021-08-31 出版日期:2022-03-28 发布日期:2022-04-28
通讯作者: Yuting Tang,E-mail:eptangyt@scut.edu.cn
基金资助:
The authors are grateful to the support given by the National Key Research and Development Program of China (2018YFC1901203), Natural Science Foundation of Guangdong Province, China (2021A1515010497), Guangzhou Science and Technology Innovation Development Special Fund, and Fundamental Research Funds for the Central Universities (2019MS017).

CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma

School of Electric Power, South China University of Technology, Guangzhou 510640, China;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510640, China

Received:2021-07-05 Revised:2021-08-31 Online:2022-03-28 Published:2022-04-28
Contact: Yuting Tang,E-mail:eptangyt@scut.edu.cn
Supported by:
The authors are grateful to the support given by the National Key Research and Development Program of China (2018YFC1901203), Natural Science Foundation of Guangdong Province, China (2021A1515010497), Guangzhou Science and Technology Innovation Development Special Fund, and Fundamental Research Funds for the Central Universities (2019MS017).

摘要/Abstract

摘要： High-temperature pyrolysis technology can effectively solve the problem of municipal solid waste pollution. However, the pyrolysis gas contains a large amount of CO₂, which would adversely affect the subsequent utilization. To address this problem, a novel method of co-precipitation modification with Ca, Mg and Zr metals was proposed to improve the CO₂ capture performance. X-ray diffraction (XRD) patterns and energy dispersive X-ray spectroscopy analysis showed that the two inert supports MgO and CaZrO₃ were uniformly distributed in the modified calcium-based sorbents. In addition, the XRD results indicated that CaZrO₃ was produced by the reaction of ZrO₂ and CaO at high temperatures. The effects of doping ratios, adsorption temperature, calcination temperature, CO₂ concentration and calcination atmosphere on the adsorption capacity and cycle stability of the modified calcium-based sorbent were studied. The modified calcium-based sorbent achieved the best CO₂ capture performance when the doping ratio was 10:1:1 with carbonation at 700 ℃ under 20% CO₂/80% N₂ atmosphere and calcination at 900 ℃ under 100% N₂ atmosphere. After ten cycles, the average carbonation conversion rate of Ca-10 sorbent was 72%. Finally, the modified calcium-based sorbents successfully reduced the CO₂ concentration of the pyrolysis gas from 37% to 5%.

关键词: Pyrolysis gas, CO₂ capture, Co-precipitation, CaO-based sorbents, Modified sorbents

Abstract: High-temperature pyrolysis technology can effectively solve the problem of municipal solid waste pollution. However, the pyrolysis gas contains a large amount of CO₂, which would adversely affect the subsequent utilization. To address this problem, a novel method of co-precipitation modification with Ca, Mg and Zr metals was proposed to improve the CO₂ capture performance. X-ray diffraction (XRD) patterns and energy dispersive X-ray spectroscopy analysis showed that the two inert supports MgO and CaZrO₃ were uniformly distributed in the modified calcium-based sorbents. In addition, the XRD results indicated that CaZrO₃ was produced by the reaction of ZrO₂ and CaO at high temperatures. The effects of doping ratios, adsorption temperature, calcination temperature, CO₂ concentration and calcination atmosphere on the adsorption capacity and cycle stability of the modified calcium-based sorbent were studied. The modified calcium-based sorbent achieved the best CO₂ capture performance when the doping ratio was 10:1:1 with carbonation at 700 ℃ under 20% CO₂/80% N₂ atmosphere and calcination at 900 ℃ under 100% N₂ atmosphere. After ten cycles, the average carbonation conversion rate of Ca-10 sorbent was 72%. Finally, the modified calcium-based sorbents successfully reduced the CO₂ concentration of the pyrolysis gas from 37% to 5%.

Key words: Pyrolysis gas, CO₂ capture, Co-precipitation, CaO-based sorbents, Modified sorbents

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma. CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases[J]. 中国化学工程学报, 2022, 43(3): 40-49.

Xiaobin Chen, Yuting Tang, Chuncheng Ke, Chaoyue Zhang, Sichun Ding, Xiaoqian Ma. CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases[J]. Chinese Journal of Chemical Engineering, 2022, 43(3): 40-49.

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CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

CO₂ capture by double metal modified CaO-based sorbents from pyrolysis gases

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