To promote and maintain the reactivity of calcium-based sorbents for CO₂ capture is essential for calcium looping technology. Biomass together with cement was doped with calcium-based sorbents pellets to promote the reactivity and enhance the sintering resistance for CO₂ capture. The influence of parameters, such as biomass types, addition, pretreatments, precursors, and cement amounts on CO₂ capture performance of sorbents are determined and an optimized process is developed for sorbents pellets making. Biomass such as coconut shell doped with calcium-based sorbents present promising enhancement in CO₂ capture capacity. Sorbents doped with pretreated biomass exhibit excellent CO₂ capture performance with a carbonation conversion of 0.6 and 0.73 after 10 cycles, respectively. The microstructures of the sorbents characterized by N₂ physisorption/desorption and the phase structure determined by in situ X-ray diffraction (XRD) are investigated as a supplement for mechanism study. The release of volatiles and pyrolysis of biomass char in sorbents are the main causes for microstructure improvement for sorbents. The formations of CaAl₂O₄, CaAl₄O₇ and Ca₁₂Al₁₄O₃₃ in sorbents during the carbonation/calcination cycles account for the enhancement of the sorbents’ sintering resistance. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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利用生物质促进钙​​基吸附剂捕集二氧化碳

促进和维持钙基吸附剂对 CO ₂捕获的反应性对于钙循环技术至关重要。生物质与水泥一起掺入钙基吸附剂颗粒，以促进反应性并增强对 CO ₂捕获的烧结阻力。确定了参数（例如生物质类型、添加、预处理、前体和水泥量）对吸附剂CO ₂捕获性能的影响，并开发了用于制造吸附剂颗粒的优化工艺。诸如掺杂有钙基吸附剂的椰子壳之类的生物质在 CO ₂捕获能力方面表现出有希望的增强。掺杂有预处理生物质的吸附剂表现出优异的 CO ₂10 次循环后的碳化转化率分别为 0.6 和 0.73。研究了以 N ₂物理吸附/解吸为特征的吸附剂的微观结构和由原位X 射线衍射 (XRD)确定的相结构，作为机理研究的补充。吸附剂中挥发物的释放和生物质炭的热解是吸附剂微观结构改善的主要原因。CaAl ₂ O ₄、CaAl ₄ O ₇和Ca ₁₂ Al ₁₄ O _{33 的形成}在碳酸化/煅烧循环过程中吸附剂中的吸附剂导致吸附剂的耐烧结性增强。© 2021 化学工业协会和 John Wiley & Sons, Ltd.