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Antioxidation Strategy of Modification with Low-Dose Inhibitors to Solid Amine Adsorbents for Long-Term Cyclic Carbon Capture from O(2)-Containing Flue Gas #MMPMID41359947
Lin L; Chen K; Li J; Hu E; Chang J; Jiang J
ACS Appl Mater Interfaces 2025[Dec]; ? (?): ? PMID41359947show ga
The existence of O(2) in flue gas, which can induce oxidative degradation and cause adsorption capacity losses, has been an obstacle for solid amine adsorbents in practical applications. Herein, a simple and scalable synthesis of PEI-impregnated silica modified with low-dose inhibitors is reported. Compared to previous studies, the novelty of this work lied in its simplicity and its ability to maintain high adsorption capacity (over 170 mg/g) when achieving excellent antioxidation and antiurea effects. The strategy can slow down the oxidation kinetics as well as relieve oxidative degradation of the adsorbents under conditions of high oxidation temperature, high O(2) concentration, and long oxidation time. The cyclic stability can be increased by 43.8%, and the O(2) resistance can be improved by 66.8%. Using a multitechnique approach, we have unraveled the effects of the separate and coexisting presence of CO(2) and O(2) in long-term applications and provided important guidance for the selection of certain inhibitors (NaH(2)PO(4), Na(3)PO(4), or HCOONa) based on actual application situations. This study demonstrated that the adsorbent modified with NaH(2)PO(4) can avoid the weakening of antiurea effects when CO(2) and O(2) coexist, while Na(3)PO(4) can still exhibit the overall effect of high cyclic stability even with the weakened antiurea effects; thus, NaH(2)PO(4) and Na(3)PO(4) have the potential for long-term carbon capture from O(2)-containing flue gas.