title: Modification of commercial NaY zeolite to give high water diffusivity and adsorb a large amount of water.
abstract: By using NaY zeolites as desiccant materials, commercial NaY zeolite was alkali treated with 1 M NaOH aqueous solution and then Mg(2+) ion-exchanged by 0.5 M Mg(NO3)2 aqueous solution. Alkali treatment (AT) of NaY zeolite removed silicon atoms selectivity from the framework of Y-type zeolite and enhanced water diffusivity of Y-type zeolite. On the other hand, Mg(2+) ion-exchange of NaY zeolite increased the amount of water adsorbed. Prepared Y-AT-Mg zeolite had both water adsorption velocity and a large difference of water adsorbed amount between adsorption at 30 °C and desorption at 100 °C.
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan. Electronic address: katoh@tokushima-u.ac.jp.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Katoh
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan.
authors.forename: Michisato
authors.initials: M
authors.lastname: Kimura
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan.
authors.forename: Mao
authors.initials: M
authors.lastname: Sugino
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan.
authors.forename: Toshihide
authors.initials: T
authors.lastname: Horikawa
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan.
authors.forename: Keizo
authors.initials: K
authors.lastname: Nakagawa
authors.affiliation: Department of Advanced Materials, Institute of Technology and Science, Tokushima University, 2-1 Minami-Josanjimacho, Tokushima 770-8506, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sugiyama
keywords: Alkali treatment; Commercial NaY zeolite; High water diffusivity; Ion exchange; Large water capacity