Investigation on specific adsorption of hydrogen on lithium-doped mesoporous silica

Masaru Kubo, Hiroshi Ushiyama, Atsushi Shimojima, Tatsuya Okubo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper reports the synthesis, structure, and hydrogen adsorption property of Li-doped mesoporous silica (MPS) with a 2D hexagonal structure. The Li-doping is achieved by impregnation of the cylindrical mesopores with an ethanol solution of lithium chloride followed by heat treatment. Detailed characterization by solid-state NMR, TG-MS, and FT-IR suggests that, during the heat treatment, lithium chloride reacts with surface ethoxy groups Si-OEt) to form =SiOLi groups, while ethyl chloride is released into the gas phase. The hydrogen uptake at 77 K and 1 atm increases from 0.68 wt% for the undoped MPS to 0.81 wt% for Li-doped MPS (Li-MPS). The isosteric heat of adsorption is 4.8 kJ∈mol-1, which is consistent with the quantum chemistry calculation result (5.12 kJ∈mol-1). The specific hydrogen adsorption on Li-MPS would be explained by the frontier orbital interaction between HOMO of hydrogen molecules and LUMO of = These findings provide an important insight into the development of hydrogen storage materials with specific adsorption sites.

Original languageEnglish
Pages (from-to)211-218
Number of pages8
JournalAdsorption
Volume17
Issue number1
DOIs
Publication statusPublished - 2011 Feb 1
Externally publishedYes

Keywords

  • Hydrogen adsorption
  • Li doping
  • Mesoporous silica
  • Quantum chemistry calculation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Surfaces and Interfaces

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