【摘要】 为了探究纳米钙基吸附剂中掺杂剂与CaO之间发生的固相反应对其自激活过程的影响,对比纳米CaO与MgO、Al₂O₃、TiO₂和ZrO₂等掺杂的合成吸附剂的微观结构以及20次钙循环中的自激活性能。结果表明,热预处理阶段发生的固相反应增加吸附剂初始结构的致密性,可以提高自激活程度。另外钙钛矿盐迁移到CaO晶粒团聚体的表面防止二次聚并,可以避免新增的活性比表面积损失,提高自激活稳定性。更多还原

【Abstract】 The microstructure and self-reactivation performance during 20 calcium-looping cycles of nano-CaO and its synthetic adsorbents doped with MgO, Al₂O₃, TiO₂ and ZrO₂ were compared for studying the effect of solid-phase reaction between dopants and CaO on the self-reactivation process of nano-CaO-based adsorbents. The results show that the solid-phase reaction in the heat pretreatment stage increased the compactness of the initial microstructure of adsorbents, which could improve the self-reactivation of adsorbents. Moreover, the migration of calcium titanium salt to the surface of CaO grains’ aggregates could prevent secondary coalescence, avoid the loss of newly increased active specific surface area and improve the self-reactivation stability of adsorbents.更多还原