CO<sub>2</sub> Capture Performance of Na<sub>2</sub>CO<sub>3</sub>/γ-Al<sub>2</sub>O<sub>3</sub> Sorbent Modified with Organic Acid
Zelin Xu, Jiliang Ma, Xiaoping Chen, Chengyu Wang, Zihang Tao, Daoyin Liu, Cai Liang
Abstract
Sodium-based sorbents (Na 2 CO 3 /γ-Al 2 O 3 ) hold significant potential for commercial application in CO 2 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 Na 2 CO 3 /γ-Al 2 O 3 sorbents and examined the performance of the sorbents in CO 2 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 CO 2 capture applications.