Calcium looping process is an important technology for high temperature CO₂ scrubbing. Calcium based sorbent decays rapidly after cyclic reactions, hence enhanced cyclic stability of the sorbent should be developed. We studied three different refractories including Al, Mg and La based supports which were synthesized using the dry mixing, wet-mixing method and Sol Gel Combustion Synthesis (SGCS) methods, through which the dopants are completely mixed into CaO/CaCO₃ particles. The sorbents were characterized by SEM/EDS and XRD. The carbonation conversion and cyclic stability of sorbents were tested by Thermo-Gravimetric Analyser (TGA) under similar conditions. TGA results demonstrated that marble-dust doped sorbents are able to achieve higher conversion than eggshell sorbents. Hence, further analysis was focused on marble-dust sorbents. SGCS exhibit much superior cyclic performance as compared to wet and dry method, however, wet method is effective due to the low cost less time consumption and scale up issues. This analysis demonstrated that marble-dust sorbents doped with Al i.e CaO:Al (90:10) maintained the best conversion (91%) and stability over 20 reaction cycles in comparison with dopant ratio CaO: Al (80:20) i.e., 73%. Similarly, Mg and La dopants showed best conversion and cyclic strength at the doping ratio of 90:10. Hence, conversion rate and cyclic stability is maximum for all the dopants Al, Mg and La with dopant ratio of 90:10 in comparison with ratios 80:20 and 70:30. Furthermore, among all the dopants, Al dopant gives highest conversion rate and cyclic stability.

钙环化工艺是高温CO ₂洗涤的重要技术。钙基吸附剂在循环反应后迅速衰减，因此应开发增强吸附剂的循环稳定性。我们研究了三种不同的耐火材料，包括Al，Mg和La基耐火材料，它们分别通过干混，湿混法和溶胶凝胶燃烧合成（SGCS）方法合成，通过这些方法将掺杂剂完全混合到CaO / CaCO _3中粒子。用SEM / EDS和XRD对吸附剂进行表征。吸附剂的碳酸化转化率和循环稳定性通过热重分析仪（TGA）在相似条件下进行测试。TGA结果表明，掺有大理石粉尘的吸附剂比蛋壳吸附剂能实现更高的转化率。因此，进一步的分析集中在大理石粉尘吸附剂上。与湿法和干法相比，SGCS具有更好的循环性能，但是，湿法由于成本低，耗时少和规模化问题而有效。该分析表明，与掺杂比CaO：Al（80:20）即73相比，掺杂Al即CaO：Al（90:10）的大理石粉吸附剂在20个反应周期内保持最佳转化率（91％）和稳定性。 ％。同样，Mg和La掺杂剂在90:10的掺杂比下表现出最佳的转化率和循环强度。因此，与比例80:20和70:30相比，所有掺杂物Al，Mg和La的掺杂比为90:10的转化率和循环稳定性最大。此外，在所有掺杂剂中，Al掺杂剂具有最高的转化率和循环稳定性。