Silicic acid as an effective accelerator and support for metal chloride for NH3 adsorption and separation

In this study, we proposed a robust and efficient accelerator-silicic acid (SA) to support metal chlorides (MCl x ) as adsorbents for NH 3 adsorption and separation. Their structures and NH 3 adsorption performance were systematically investigated. Results revealed that SA with abundant hydroxyl group could dissociate and immobilize MCl x to realize synergistic M x + –NH 3 coordination and Cl - –NH 3 hydrogen bonding. Meanwhile, the interactions between the MCl x and SA significantly reduced the desorption energy of the adsorbent. The outstanding LiCl-3@SA composite demonstrated remarkable NH 3 adsorption capacity of 17.20 mmol NH 3 /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 MCl x −porous support interactions and strategy to design efficient composites for NH 3 capture.