Preparation of eggshell-derived calcium-based adsorbent and its CO2 adsorption performance
The capture of carbon dioxide(CO2)after the utilization of fossil energy is an important measure to achieve carbon peaking and carbon neutrality goals.Calcium(Ca)-based adsorbent has good CO2 cyclic adsorption performance at high temperature,which can achieve efficient adsorption and separation of CO2.In order to develop Ca-based adsorbents with low cost and high cycle performance,in this paper,calcium-based adsorbents were prepared by sol-gel self-propagating combustion synthesis and hydrothermal method using waste egg shells as raw materials,and Ca-based adsorbents were doped with yttrium(Y).The CO2 cycle adsorption performance of the adsorbent was investigated in a high temperature fixed bed.The results show that the Y-doped modified Ca-based adsorbent prepared by sol-gel self-propagating combustion method has a loose and porous structure,small oxide grains and large specific surface area,and has good CO2 adsorption and cycle performance.The initial adsorption capacity is as high as 0.581 g/g,which decays to 0.531 g/g after 5 cycles of adsorption,and decays to 0.504 g/g after 15 cycles of adsorption.Y doping can effectively improve the cyclic adsorption performance of Ca-based adsorbents.However,compared with samples with different Y doping amounts,when the mass ratio of CaO to Y2O3 is 8:2,the cyclic adsorption performance of modified Ca-based adsorbents is the best,and the maximum adsorption capacity can reach 0.65 g/g.The Y-doped Ca-based adsorbents prepared by hydrothermal method are mostly spherical granular crystals,but the adsorption performance is obviously not as good as the samples prepared by self-propagating combustion method.Using egg shells as raw materials,high-efficiency Ca-based CO2 adsorbents can be successfully prepared by sol-gel self-propagating combustion method to achieve the purpose of'treating pollution with waste'and realize the resource utilization of solid waste.Y doping modification can effectively improve the cycle performance of adsorbents and has good industrial application prospects.
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