Inorganic Chemicals Industry >

2026 , Vol. 58 >Issue 2: 60 - 67

DOI: https://doi.org/10.19964/j.issn.1006-4990.2024-0655

Research & Development

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

  • WU Jie ,
  • XU Chunhui ,
  • WANG Feng ,
  • TANG Zhongfeng
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  • 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 date: 2025-12-04

  Online published: 2025-05-21

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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

Cite this article

WU Jie , XU Chunhui , WANG Feng , TANG Zhongfeng . Effect of NaNO3 doping on structure and adsorption-desorption performance of MgO-based CO2 adsorbents[J]. Inorganic Chemicals Industry, 2026 , 58(2) : 60 -67 . DOI: 10.19964/j.issn.1006-4990.2024-0655

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