The　Li-ISX　zeolite　was　synthesized　via　ion　exchange　method　with　Na-LSX　zeolite　as　a　starting　material,　and　its　structural　properties　were　characterized　using　FT-IR,　SEM　and　TG-DSC　techniques.　The　results　showed　that　the　water　adsorption　capacity　of　Li-LSX　was　enhanced　but　its　thermal　stability　was　decreased　compared　with　that　of　Na-LSX.　Meanwhile,　combined　with　in　situ　HTXRD　patterns,　the　parallel　exothermal　DSC　profiles　demonstrated　that　cationic　radius　and　adsorbed　water　in　FAU　framework　had　remarkable　influence　on　the　thermal　stability　of　Li-LSX　and　Na-LSX.　In　addition,　the　amount　of　N-2　adsorbed　on　Li-ISX　at　room　temperature　(298　K)　was　around　19.76　g/cm(3),　which　was　higher　than　that　of　Na-LSX　(5.42　g/cm(3)).　Whereas,　N-2　adsorption-desorption　isotherm　of　Li-LSX　at　77　K　showed　the　BET　surface　area　(778.0　m(2)/g)　and　relevant　pore　volume　(0.40　cm(3)/g)　were　higher　than　those　of　Na-LSX　(622.5　m(2)/g　and　0.33　cm(3)/g),　respectively.　These　results　suggested　that　the　N-2　adsorption　capacities　of　LSX　zeolites　at　77　K　could　be　determined　mainly　according　to　their　porosity;　while,　at　298　K,　the　adsorption　capacities　depended　on　both　the　N-2-cation　interaction　and　their　porosity.　Therefore,　it　was　concluded　that　the　charge　density　and　cationic　radius　(Na+　and　Li+)　had　a　remarkable　influence　on　their　adsorption　performance,　structural　parameters　(textural　parameters)　and　their　stability.　(C)　2014　Elsevier　Inc.　All　rights　reserved.