Abstract
In this study, we proposed a robust and efficient accelerator-silicic acid (SA) to support metal chlorides (MClx) as adsorbents for NH3 adsorption and separation. Their structures and NH3 adsorption performance were systematically investigated. Results revealed that SA with abundant hydroxyl group could dissociate and immobilize MClx to realize synergistic Mx+–NH3 coordination and Cl-–NH3 hydrogen bonding. Meanwhile, the interactions between the MClx and SA significantly reduced the desorption energy of the adsorbent. The outstanding LiCl-3@SA composite demonstrated remarkable NH3 adsorption capacity of 17.20 mmol NH3/g-adsorbents at 30 °C and 1.0 bar and adsorption enthalpy of −50.23 kJ/mol. Present work provided valuable information on deep understanding of MClx−porous support interactions and strategy to design efficient composites for NH3 capture.
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