4.7 Article

Adsorption of hydrogen and deuterium in MnO2 modified NaX zeolites

Journal

MICROPOROUS AND MESOPOROUS MATERIALS
Volume 152, Issue -, Pages 219-223

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2011.11.029

Keywords

Zeolite; Hydrogen adsorption; Surface modification; Kubas interaction

Funding

  1. National Natural Science Foundation of China [21103204]
  2. State Key Laboratory of Physical Chemistry of Surfaces [SPC201004]

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MnO2 modified NaX zeolites are prepared by dispersion of MnO2 on the surface of NaX in a calcination process. XRD, XPS and N-2 adsorption tests confirm that the dispersed MnO2 is primarily monolayer and the calcination conditions affect the dispersion efficiency. The adsorption performances of hydrogen and deuterium of the modified zeolites are investigated at both 77 K and 295 K. A hydrogen adsorption capacity increase up to 30% is observed at 295 K for NaX with moderate MnO2 modification, but the corresponding adsorption at 77 K does not show much improvement, and even deteriorates for the samples with high MnO2 contents. NaX shows an adsorption capacity difference of 11% between hydrogen and deuterium at 9 bar and 77 K, higher than that of MnO2 modified samples (4%); while the difference is much smaller at 295 K for all samples. The effects of MnO2 modification on hydrogen adsorption properties are explained by the involvement of Kubas interaction, where Mn in MnO2 acts as a d-electron donor for the enhanced binding of hydrogen molecules. (C) 2011 Elsevier Inc. All rights reserved.

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