Sodium-based sorbents (Na₂CO₃/γ-Al₂O₃) hold significant potential for commercial application in CO₂ capture. The key point in optimizing the sorbent is to enhance its reaction activity and adsorption capacity. This study utilized organic acids as modifiers for Na₂CO₃/γ-Al₂O₃ sorbents and examined the performance of the sorbents in CO₂ capture before and after modification. The results show that the organic acid modification plays a crucial role in adjusting the surface hydroxyl groups, reducing the grain size of the active component, and optimizing the ratio of high-index crystal surface exposure. The novel sorbent, modified with citric acid monohydrate, exhibited an exceptional reaction performance. It achieved a carbonation conversion rate of 88.9% when modified with citric acid at an equivalent ratio of 2.5, representing a substantial enhancement of 31% from the bare sample. The organic acid modification significantly contributes to optimizing the performance of sodium-based sorbents, thereby advancing their potential for practical CO₂ capture applications.

中文翻译：

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有机酸改性Na2CO3/γ-Al2O3吸附剂的CO2捕集性能

钠基吸附剂(Na ₂ CO ₃ /γ-Al ₂ O _{3 )在CO 2}捕获的商业应用中具有巨大的潜力。优化吸附剂的关键是提高其反应活性和吸附能力。本研究利用有机酸作为Na ₂ CO ₃ /γ-Al ₂ O ₃吸附剂的改性剂，考察了改性前后吸附剂捕集CO ₂的性能。结果表明，有机酸改性对于调节表面羟基、减小活性组分晶粒尺寸、优化高折射率晶体表面暴露比例等发挥着至关重要的作用。用一水柠檬酸改性的新型吸附剂表现出优异的反应性能。当用2.5当量比的柠檬酸改性时，碳酸化转化率达到88.9%，较裸样品大幅提高31%。有机酸改性显着有助于优化钠基吸附剂的性能，从而提高其实际CO ₂捕集应用的潜力。