热力发电2025，Vol.54Issue(10)：31-40,10.DOI:10.19666/j.rlfd.202501001
基于模板法合成的Al2O3/CeO2改性复合CaO材料的储放热性能研究
Thermochemical energy storage performance of composite CaO materials doped with Al2O3/CeO2 synthesized by the template method
摘要
Abstract
Thermochemical thermal storage has attracted wide attentions because it has high thermal density heat storage and can realize seasonal thermal storage and long-distance transportation.The CaCO3/CaO reaction system,as one of the most promising thermochemical heat storage materials,has problems such as particle aggregation and sintering as the number of heat storage cycles increases,and the material gradually loses its activity.To solve this problem,composite CaO materials doped with Al2O3 or CeO2 were synthesized by the template method.The microstructure of the materials and the effect of chemical doping on the cyclic stability of the composite CaO materials were investigated by means of characterization tests such as X-ray diffraction(XRD),scanning electron microscopy(SEM)and synchronous thermal analyzer(STA).The effect of chemical doping on exothermic reaction temperature range of the composite CaO materials was analyzed.The results show that,the CaO prepared by the template method has a richer pore structure and a superior cycling stability than the CaO obtained by decomposition of CaCO3.When the doping molar ratio of CaO to Al2O3 is 100.0:2.5(Ca:Al),the composite has the best cycling stability.After 30 cycles,the effective conversion rate decays by only about 7.1%from 0.70 to 0.65 and the exothermic energy density is 2 057 kJ/kg.The cyclic stability of the composite is better than that of CaO when the molar ratio of CaO to CeO2 doping is 100.0:10.0(Ca:Ce=100.0:10.0).It is found that doping with Al2O3 decreases the onset temperature of the exothermic reaction of the CaCO3/CaO reaction system,whereas CeO2 increases the onset temperature.关键词
热化学储热/模板法/材料改性/循环稳定性/放热反应温度区间Key words
thermochemical storage/template method/material modification/cyclic stability/exothermic reaction temperature range引用本文复制引用
曹纯玉,闫君,赵长颖..基于模板法合成的Al2O3/CeO2改性复合CaO材料的储放热性能研究[J].热力发电,2025,54(10):31-40,10.基金项目
国家重点研发计划项目(2023YFB4005403) （2023YFB4005403）
国家自然科学基金重大项目(52090063) （52090063）
上海市科技创新行动计划项目(23DZ1200900)National Key Research and Development Program(2023YFB4005403) （23DZ1200900）
Major Program of National Natural Science Foundation of China(52090063) （52090063）
Shanghai Science and Technology Innovation Action Plan(23DZ1200900) （23DZ1200900）
