Exploring　absorbents　showing　low　volatility,　high　efficiency　and　good　reversibility　for　NH3　absorption　is　of　great　significance.　In　this　work,　a　novel　class　of　DESs　with　both　weak　acid　site　and　strong　hydrogen-bond　donating　site　were　designed　by　using　imidazolium　hydrogen　chloride　([ImH]Cl)　and　glycerol　(Gly)　as　the　motifs.　The　densities,　viscosities　and　thermal　stabilities　of　DESs　were　measured　first.　Then,　the　solubility,　reversibility　and　selectivity　of　DESs　for　NH3　absorption　were　investigated　systematically.　It　is　found　that　the　absorption　of　NH3　in　DESs　is　chemical　type,　and　there　is　strong　interaction　existing　between　DESs　and　NH3.　As　a　result,　the　NH3　solubilities　of　DESs　are　very　attractive　especially　at　low　pressures,　with　the　values　of　12.934　mol/kg　at　298.2　K　and　101.3　kPa,　and　4.450　mol/kg　at　298.2　K　and　10.0　kPa.　The　NH3　absorbed　by　DESs　can　be　easily　desorbed　by　heating　and　evacuating.　Moreover,　the　absorption　of　N2　and　H2　in　DESs　is　negligible,　and　has　little　effect　on　the　absorption　of　NH3.　Finally,　the　underlying　mechanism　of　NH3　absorption　was　examined　by　theoretical　and　spectroscopic　technique.　©　2021　Elsevier　B.V.