CO₂ utilization through high temperature CO₂ enhanced sorption processes is a promising pathway to achieve widespread decarbonisation and to be successful, highly performing CO₂ acceptors have to be developed. In this work, a fly ash derived lithium silicate material (Li-FA) was evaluated as CO₂ sorbent under simulated biomass gasification conditions. The CO₂ uptake tests were carried out using a high-pressure wire mesh apparatus between 380 °C and 700 °C, 15 bar and in presence of steam, H₂, CO and CO₂. The Li-FA sorbent was able to selectively adsorb CO₂ with a maximum uptake of 4.2 mmol CO₂/g at 700 °C under 4.5 bar CO₂ (15 bar P total). The stability of the Li-FA CO₂ sorbent was tested under more realistic exposition time in a 10-cycles experiment at 700 °C. Adsorption was very fast (138 mg CO₂/g in average) requiring less than 20 s to achieve about 95 % of the total CO₂ uptake of 3.2 mmol/g after 10 cycles and only 2 min to desorb the CO₂ at 710 ° C and 15 bar. SEM/elemental mapping revealed that the good elemental dispersion was retained unchanged after 10 cycles. The kinetic analysis demonstrated that the sorption constants k₁ and k₂ were larger than those of similar high-temperature sorbents, which combined to their stability and CO₂ uptake capacity offer promising application in CO₂ sorption enhanced processes.

CO ₂利用率通过高温CO ₂增强吸附过程是一个有希望的途径，以实现广泛脱碳和是成功的，高度进行CO ₂受体必须开发。在这项工作中，飞灰衍生的硅酸锂材料 (Li-FA)在模拟生物质气化条件下被评估为 CO ₂吸附剂。CO ₂吸收测试使用高压丝网装置在380°C和700°C之间、15巴和蒸汽、H ₂、CO和CO ₂存在下进行。Li-FA 吸附剂能够选择性吸附 CO ₂，最大吸收量为 4.2 mmol CO ₂/g 在 700 °C 和 4.5 bar CO ₂（15 bar P 总量）下。Li-FA CO ₂吸附剂的稳定性在更真实的暴露时间下在 700 °C 下进行了 10 次循环实验。吸附速度非常快（平均138 mg CO ₂ /g），在 10 次循环后，只需不到 20 秒即可达到3.2 mmol/g的总 CO ₂吸收的约 95%，并且在 710°下解吸 CO ₂仅需 2 分钟C 和 15 巴。SEM/元素映射显示，良好的元素分散在 10 次循环后保持不变。动力学分析表明吸附常数k ₁和k ₂比类似的高温吸附剂大，结合它们的稳定性和 CO ₂吸收能力，在 CO ₂吸附增强过程中提供了有前景的应用。