LI Lulu,XU Yufeng,JING Jieying,et al. Research progress on the influence of metal element doping on the structure andanti-sintering performance of medium and high temperature CO2 adsorbents[J].Clean Coal Technology,2025,31(4):140−153.

With the increasing severity of environmental pollution,carbon capture,utilization,and storage technology has become acrucial means to mitigate climate change. Magnesium oxide (MgO) and calcium oxide (CaO) based adsorbents have been widelystudied due to their advantages of widely available sources,low cost,and high theoretical adsorption capacity. However,as the adsorption-desorption cycle progresses,the adsorbent particles undergo agglomeration,decreased pore volume,and reduced specific surface area,leading to a significant decrease in adsorbent activity,limiting the widespread application of MgO and CaO-based adsorbents in industry.Therefore,enhancing the anti-sintering performance of MgO and CaO-based adsorbents has become a research hotspot,which can beimproved by doping metal elements. In order to enable researchers to select and design dopant elements more purposefully,this worksummarized the different action mechanisms of doped metal elements on MgO-based adsorbents and CaO-based adsorbents,as well as theeffects of different metal elements on the structure and performance of adsorbents. On the one hand,composite materials can be preparedby adding metal oxides,and the doped metal oxides with high Tamm temperature can act as inert components to inhibit adsorbent particleagglomeration and structural collapse. Doping metal oxides rich in oxygen vacancies can increase the number of oxygen vacancies on theadsorbent,promoting the diffusion of CO2 molecules and the migration of O ions. The presence of oxygen vacancies can also build solidion transport channels,leading to a unique three-stage mechanism (reaction-coupling-diffusion) during carbonation,therebyenhancing the anti-sintering ability and adsorption performance of the adsorbent. On the other hand,doping alkali metal elements causesthe crystal lattice distortion of MgO-based adsorbents and CaO-based adsorbents,resulting in the formation of higher concentrations ofcrystal defects,thereby enhancing ion migration rates and improving the adsorption kinetics based on surface reactions,therebyaccelerating the carbonation reaction rate and enhancing CO2 adsorption performance. The different mechanisms may simultaneouslyexist in the reaction. In the future,it is crucial to concentrate on enhancing the regeneration efficiency of adsorbents and minimizingenergy consumption during reactions following metal doping. Additionally,investigating the influence patterns of metals with similardoping mechanisms on adsorption performance is essential. Furthermore,evaluating the performance of adsorbents under industrialapplication conditions will facilitate the selection of appropriate metal elements for subsequent experimental studies. This approach willaid in designing cost-effective and high-performance metal-doped adsorbents,thereby advancing their large-scale industrial application.

李路路(1999—),女,河南项城人,硕士研究生。E-mail:2023520997@link.tyut.edu.cn

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