镁负载制备高活性钙基吸收剂循环捕集CO2研究进展

Research Progress on Synthesis of CaO/MgO Sorbents and Their CO Capture Capacities

钙循环被认为是最具大规模应用前景的CO2捕集技术。但由于高温烧结作用,钙基吸收剂的反应活性随循环次数增加急剧衰减。如何抑制吸收剂的烧结从而提高吸收剂捕集CO2反应活性及循环稳定性意义重大,钙基吸收剂中惰性负载MgO能有效提高吸收剂循环捕集CO2性能。综述了镁负载钙基吸收剂制备方法及其捕集CO2性能,发现钙镁来源以及制备方法对镁负载钙基吸收剂反应活性及循环稳定性存在很大影响。对比发现,燃烧合成法和模板造孔法是比较可行的两种制备方法。提出采用不可溶钙镁来源制备高活性镁负载钙基吸收剂以及吸收剂成型作为今后的研究重点。

Calcium looping process is one of the most potential CO2 capture methods. However, the CO2 capture capacity of the calcium based sorbent used in this process decays sharply with cycle number. The research on inhibiting the sintering of the calcium based sorbent to enhance the CO2 capture capacity is meaningful. Adding MgO into the calcium based sorbent as inert support is one efficient method that can enhance the CO2 capture capacity of the sorbent. The synthesis of MgO supported calcium based sorbent and the CO2 capture capacity was summarized. It was found that the Ca and Mg precursors and the synthesis methods had obvious effect on the CO2 capture capacity of the synthetic sorbents.Combustion method and carbon templating method were two practical methods for CaO/MgO sorbent. Synthesizing the CaO/MgO sorbent with insoluble Ca and Mg precursors and the pelleting of the synthetic CaO/MgO were proposed to be investigated in detail in the future.