Metal chlorides-promoted ammonia absorption of deep eutectic solvent

Tetrazole-Based Deep Eutectic Solvents with Multiple Hydrogen Bonding Sites for Highly Efficient Uptake of NH3

“…The NH 3 capacities of TetrZ-based DESs are compared with those of various DESs, as shown in Table S8 (see Supporting Information) at temperatures of 303.15 and 313.15 K. As can be seen, TetrZ-based DESs studied herein have comparable NH 3 capacities. Especially, at 101.3 kPa, TetrZ + 1,2,3-Tri DESs have higher NH 3 capacities (0.206–0.243 g NH 3 ·g DES –1 ) than the other DESs reported in the literature, − ,− ,− e.g., NH 4 SCN + Gly (2:3) (0.176 g NH 3 ·g DES –1 ), NH 4 SCN + EG (1:3) (0.168 g NH 3 ·g DES –1 ), and GA + XYL (3:1) (0.189 g NH 3 ·g DES –1 ) . In addition, TetrZ + 1,2,3-Tri DESs are superior to other azole-based DESs, including 1,2,4-Tri +1,2,3-Tri (1:2)­(0.173 g NH 3 ·g DES –1 ), MAA + TetrZ (2:1) (0.136 g/g), ChCl + TetrZ + EG (3:7:14) (0.169 g/g), 1,2,4-Tri + Gly (1:3) (0.147 g/g), and [Emim]­Cl + TetrZ (1:1) (0.179 g/g) .…”

A Mini-Review on NH3 Separation Technologies: Recent Advances and Future Directions

“…31,37 Inspired by this, Cheng et al used EtACl and metal chlorides (e.g., SnCl 2 , ZnCl 2 , FeCl 3 , and CoCl 2 ) as the HBAs and Gly as the HBD to form a kind of metal-based DESs for efficient absorption of NH 3 . 55 56,57 Table 2 summarizes the functional types and NH 3 absorption capacities of representative DESs reported in the literature. 48−74 Although DESs can be more easily obtained than ILs, high viscosity is still a drawback of most DESs, which mainly comes from the strong hydrogen-bond interaction between HBAs and HBDs.…”

“…The sequence of NH 3 absorption capacities is EtACl+SnCl 2 +Gly < EtACl+ZnCl 2 +Gly < EtACl+FeCl 3 +Gly < EtACl+CoCl 2 +Gly, which is consistent with the sequence of the coordination ability of corresponding metal ions with NH 3 . Besides, Li et al used LiCl as the HBA and EG as the HBD, and Sun et al used metal chlorides (e.g., MgCl 2 , NiCl 2 , CaCl 2 , MnCl 2 , and ZnCl 2 ) as the HBA and Res+EG as the HBDs, to construct two other kinds of metal-based DESs for efficient absorption of NH 3 . , …”

“…Table summarizes the functional types and NH 3 absorption capacities of representative DESs reported in the literature. − Although DESs can be more easily obtained than ILs, high viscosity is still a drawback of most DESs, which mainly comes from the strong hydrogen-bond interaction between HBAs and HBDs . In addition, most DESs currently reported are constructed from halide compounds, which are highly corrosive to industrial facilities .…”

Highly efficient and reversible adsorption of ammonia by incorporation of deep eutectic solvents into silica gel and Al2O3

“…For enhancing the low mass transfer rate of the viscous DESs, the usual strategy is to impregnate them onto porous materials with high surface area; for example, silica gel, polymers, molecular sieves, and activated carbon. [51][52][53][54][55] Ghazali et al 55 introduced ChCl:U:PEI DESs onto SG200 to prepare a new solid adsorbent for CO 2 , the DESsupported composite demonstrated 60% higher adsorption ability than the original SG200.…”