(196j) Highly Dispersed Ionic Liquids in Mesoporous Molecular Sieves Enable a Record NH3 Absorption

Ammonia (NH₃) has high hydrogen energy density and is a promising sustainable energy in the future. However, developing simple, stable and efficient materials for NH₃ uptake and storage remains a challenge. Here, a family of stable ionic liquid hybrid materials have been developed by simple impregnation of Zn-based ionic liquids (ZnILs) into stable mesoporous molecular sieve FDU-12 for high-efficient NH₃ capture. The ZnIL hybrid adsorbents exhibit a record NH₃ adsorption capacity (25.2 mmol/g at 25.0 °C and 1.0 bar), along with exceptionally high uptake at high temperature (15.2 mmol/g at 80.0 °C and 1.0 bar) and low NH₃ concentration (5.0 mmol/g at 25.0 °C and 10000 ppm). Notably, [C₁NH₃][Zn₃Cl₇]@FDU-12-40% shows almost unchanged breakthrough performance after 5 cycles, indicating excellent cycling stability of these hybrid adsorbents. It is revealed that such superior NH₃ capacity is mainly attributed to the highly dispersed ZnILs in FDU-12, which facilitates the coordination and hydrogen bonding interactions of NH₃ with the ionic liquids.