无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2026, Vol. 58 ›› Issue (2): 60-67.doi: 10.19964/j.issn.1006-4990.2024-0655

• 研究与开发 • 上一篇    下一篇

NaNO3掺杂对氧化镁基CO2吸附剂结构与吸脱附性能的影响

武洁1,2(), 许春辉2, 王峰2(), 唐忠锋3()   

  1. 1.内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,内蒙古 呼和浩特 010020
    2.内蒙古工业大学能源与动力工程学院,内蒙古 呼和浩特 010051
    3.中国科学院上海应用物理研究所,上海 201800
  • 收稿日期:2025-12-04 出版日期:2026-02-10 发布日期:2025-08-01
  • 通讯作者: 王峰(1981— ),女,博士,教授,主要研究方向为碳捕集技术、熔盐储热;E-mail:wangfeng@imut.com
    唐忠锋(1976— ),男,博士,研究员,主要研究方向为能源材料化学、碳捕集和熔盐储能等;E-mail:tangzhongfeng@sinap.ac.cn
  • 作者简介:武洁(1986— ),女,博士研究生,高级工程师,主要研究方向为能源与环境保护;E-mail:wujiegongda@126.com
  • 基金资助:
    内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司项目(2023-ZC-1-05);国家自然科学基金区域创新发展联合基金(U22A20434)

Effect of NaNO3 doping on structure and adsorption-desorption performance of MgO-based CO2 adsorbents

WU Jie1,2(), XU Chunhui2, WANG Feng2(), TANG Zhongfeng3()   

  1. 1.Inner Mongolia Power Research Institute Branch,Inner Mongolia Power(Group) Co. ,Ltd. ,Hohhot 010020,China
    2.School of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,China
    3.Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China
  • Received:2025-12-04 Published:2026-02-10 Online:2025-08-01

摘要:

MgO比表面积小,碱性位点少,对CO2吸附量较低,远未达到其对CO2的理论吸附量。同时,吸附CO2后的MgO极易板结,进而影响其循环稳定性。如何改善MgO活性、孔结构并提高其循环稳定性是实现MgO作为CO2吸附剂亟待解决的难题。研究以水氯镁石和电石渣为原料,采用固相煅烧法结合NaNO3掺杂制备MgO基吸附剂,通过实验测试与密度泛函理论研究NaNO3掺杂对MgO基吸附剂结构和吸脱附性能的影响。结果表明,固相煅烧法制备的MgO基吸附剂对CO2吸附率低,掺杂NaNO3后其对CO2吸附率显著提升,其对CO2最大吸附率为24.26%。NaNO3掺杂MgO基吸附剂吸附CO2后,样品主要成分为MgCO3,脱附CO2后样品主要成分为MgO,在吸脱附阶段,样品中NaNO3未发生变化。密度泛函理论计算结果表明,掺杂NaNO3后MgO基吸附剂吸附CO2后出现CO32-峰,CO2在MgO表面的最大吸附能为-1.587 eV,MgO表面生成MgCO3,掺杂NaNO3后可促进MgO对CO2的吸脱附性能。研究结果为MgO基吸附剂的制备提供重要研究方法和数据支撑,具有重要的学术研究意义和实际应用价值。

关键词: 氧化镁, 二氧化碳, 熔盐, 掺杂, 吸附

Abstract:

The specific surface area of MgO is small,and the number of basic sites is limited.The CO2 adsorption capacity of the MgO is significantly lower than its theoretical potential.Following CO2 adsorption,MgO tends to become compact,which negatively impacts its cycling stability.Consequently,enhancing the activity and pore structure of MgO and improving its cycling stability are pressing issues for the application of MgO as a CO2 adsorbent.MgO-based adsorbents were prepared using a solid-phase calcination method combined with NaNO3 doping,with bischofite and carbide slag as the raw materials.The effect of NaNO3 doping on the structure and adsorption-desorption performance of the MgO-based adsorbents was investigated through experimental testing and density functional theory.The results indicated that MgO-based adsorbents produced via solid-phase calcination exhibited a low CO2 adsorption rate.However,the CO2 adsorption rate of the MgO-based adsorbents doped with NaNO3 reached a maximum of 24.26%.MgCO3 was formed and covered on the surface of the MgO-based adsorbent doped by NaNO3 after CO2 adsorption.Following CO2 desorption,the main component of the MgO-based adsorbent became MgO.Notably,the NaNO3 within the sample remained unchanged after CO2 adsorption and desorption cycles.Density functional theory calculations revealed that doping with NaNO3 resulted in a CO32- peak after CO2 adsorption,and the maximum adsorption energy of CO2 on the MgO surface was -1.587 eV.MgCO3 generated on the MgO surface and the doping with NaNO3 could promote the adsorption and desorption performance of MgO for CO2.This research offered significant methodological insights and data support for the development of MgO-based adsorbents,holding both substantial academic research significance and practical application value.

Key words: MgO, CO2, molten salt, doping, adsorption

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