化工学报2011，Vol.62Issue(10)：2905-2913,9.DOI:10.3969/j.issn.0438-1157.2011.10.032
复合钙基CO2吸收剂的反应性能及显微结构
Reactivity and microstructure of synthetic CaO-based sorbents for CO2 capture
摘要
Abstract
Regeneratable CaO-based sorbents for CO2 capture during coal combustion process are receiving more and more attention. Unfortunately, the CO2 sorbtion capacity of CaO-sorbents based on natural limestone decreases rapidly with times of capture-and-release cycle because of severe sintering. This sintering can be effectively mitigated by properly doping metal oxides. In this paper an attempt was done to prepare a class of synthetic CaO/La2O3 and CaO/MgO sorbents by sol-gel method. The CO2 sorption capacity of these doped CaO-based sorbents in multi-cycles and the effect of additive La3+ or Mg2+ were investigated in a fixed bed reactor. The results show that additive of La2O3 or MgO plays a positive role in the multiple capture/regeneration reactions. Based on XRD analysis, it is concluded that addition of La3+ or Mg2+ can significantly reduced the crystalline size of CaO. Furthermore, it is also showed from FSEM images analysis that the CaObased sorbents doped La3+ also have certain degree sintering. However, the La3+ can get into CaO crystal, resulting in activation of CaO lattice and increase of cation vacancy, which can plays a positive role in the process of capturing CO2, thereby greatly improve the reactivity of these sorbents.关键词
CO2捕集/钙基吸收剂/掺杂/晶粒尺寸Key words
CO2 capture/ CaO-based sorbents/ doped-CaO/ crystalline size分类
能源科技引用本文复制引用
吴琪珑,郑瑛,罗聪,丁宁,边关,郑楚光..复合钙基CO2吸收剂的反应性能及显微结构[J].化工学报,2011,62(10):2905-2913,9.基金项目
国家重点基础研究发展计划项目(2011CB707301) （2011CB707301）
国家自然科学基金项目(50936001,51021065). （50936001,51021065）
