A novel surfactant-assisted approach to preparing a nanostructured lithium orthosilicate (LOS) has been developed by adding a polyether amine surfactant to aqueous citrate sol–gel. The ratio of surfactant to SiO₂ was critical to producing an LOS that is stable to carbonation/decarbonation cycles. Preferred LOS compositions sorb 26 wt % CO₂ within 1 min from a 50 vol % CO₂/N₂ stream and show no observed loss in a 33 wt % working capacity in 1 h isothermal steam cycles. The novel synthetic approach generates a product-like precursor phase with nanoscale domains of lithium metasilicate and lithium carbonate stabilized by a carbonaceous component that originates from the degradation of citrate and surfactant species. This composition is required to achieve an LOS with properties enabling sorption-enhanced catalysis. Physically meaningful rate constants and diffusivities are provided by a piecewise adaptation of the Ishida and Wen core–shell model, confirming faster reaction and diffusion kinetics for these high-performing LOS. An overall working hypothesis of key results helps to explain robustness in sorption cycling and suggests the advantages of a product-focused sorbent design.

中文翻译：

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表面活性剂介导的原硅酸锂复合材料可实现快速高温 CO ₂吸收

通过将聚醚胺表面活性剂添加到柠檬酸盐溶胶-凝胶中，开发了一种新的表面活性剂辅助制备纳米结构原硅酸锂 (LOS) 的方法。表面活性剂与 SiO _{2 的}比例对于产生对碳酸化/脱碳酸循环稳定的 LOS 至关重要。优选的组合物LOS SORB 26重量％CO ₂在1分钟内从50％（体积）CO ₂ / N ₂在 1 小时等温蒸汽循环中，没有观察到 33 wt% 的工作容量损失。这种新的合成方法产生了一种类似产品的前体相，其中含有偏硅酸锂和碳酸锂的纳米级区域，该区域由源自柠檬酸盐和表面活性剂物质降解的含碳成分稳定。需要这种组合物来实现具有能够增强吸附的催化性能的 LOS。Ishida 和 Wen 核壳模型的分段改编提供了具有物理意义的速率常数和扩散率，证实了这些高性能 LOS 的反应和扩散动力学更快。关键结果的总体工作假设有助于解释吸附循环的稳健性，并表明以产品为中心的吸附剂设计的优势。