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钙基高温碳化/煅烧循环的燃后CO2分离技术已经被证明为燃煤电厂尾气CO2捕捉最有吸引力的方式之一。但是,随着循环反应次数的增加,再生的CaO的捕捉效率迅速降低。为了提高多次循环后CaO的碳化效率。文中采用了溶胶凝胶燃烧合成法制备了纳米复合CaO/MgO吸收剂,其中CaO与MgO的摩尔比为10:1。研究结果表明,采用该方法所制备的钙基吸收剂微观结构蓬松,更有利于增强吸收剂在高温碳酸化过程中的CO2吸附能力。新型复合吸收剂虽然MgO的掺杂量较小,但是仍然具有良好的循环反应性能,孔隙结构在碳化/煅烧过程中相对保持稳定。在30次碳化/煅烧循环后,其碳化效率达到66%,远高于普通分析纯CaO吸收剂。
The post-combustion CO2 separation technology for calcium-based high-temperature carbonization / calcination cycles has proven to be one of the most attractive ways to capture CO2 from the exhaust of coal-fired power plants. However, with the increase in the number of cycles, the capture efficiency of regenerated CaO rapidly decreases. In order to improve the carbonation efficiency of CaO after many cycles. In this paper, the nano-composite CaO / MgO absorbent was prepared by sol-gel combustion synthesis, in which the molar ratio of CaO to MgO was 10: 1. The results show that the microscopic structure of the calcium-based absorbent prepared by this method is fluffy and more conducive to enhancing the CO2 adsorption capacity of the absorbent during high-temperature carbonation. Although the new composite absorbent has a smaller doping amount of MgO, it still has good cyclic reactivity, and the pore structure remains relatively stable during the carbonization / calcination process. After 30 cycles of carbonization / calcination, its carbonization efficiency reached 66%, far higher than that of ordinary analytical grade CaO absorbers.