title: Characterization of ESR active species on lithium chloride-modified mesoporous silica.
abstract: The surface of mesoporous silica with regular nanometer-sized pores and high surface area has been modified by metal ions or functional groups to introduce specific interactions. We found that ESR active species were formed on lithium chloride (LiCl)-modified mesoporous silica after heat treatment. The structure and the surface properties of LiCl-modified mesoporous silica were characterized by XRD, ESR, nitrogen adsorption, UV-vis-NIR, and TPD. The results suggest that the ESR active species were generated on the surface in response to heat treatment above 673 K. Moreover, it was found for the first time that LiCl-modified mesoporous silica after the heat treatment has reversible adsorption properties for hydrogen under room temperature and atmospheric pressure.
authors.affiliation: Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Naotaka
authors.initials: N
authors.lastname: Chino
authors.forename: Masaru
authors.initials: M
authors.lastname: Ogura
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Kodaira
authors.forename: Jun
authors.initials: J
authors.lastname: Izumi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Okubo