Enhanced hydrogen adsorption in ordered mesoporous carbon through clathrate formation

Dipendu Saha, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Ordered mesoporous carbons were synthesized with a soft-template approach and modified with a water and tetrahydrofuran mixture having a H2O/THF molar ratio of 17:1 as potential adsorbent media for hydrogen storage. Hydrogen adsorption equilibrium on the carbon adsorbents was measured gravimetrically at 270 K and hydrogen pressures up to 163 bar. Enhanced hydrogen adsorption was observed on the carbon adsorbents doped with 0.5 wt.% and 0.75 wt.% of H2O/THF due to the combined effects of hydrogen adsorption on the carbon surface and formation of a binary H2-H2O-THF clathrate. Hydrogen adsorption capacities on the carbon adsorbents doped with 0.5 wt.%, 0.75 wt.% of H2O/THF, and the pure carbon at 270 K and 163 bar are 0.747 wt.%, 0.646 wt.% and 0.585 wt.%, respectively. The hydrogen adsorption isotherms on all the doped carbon adsorbents are of typical Type III and can be well correlated by the Freundlich equation. A desorption hysteresis loop was observed on the carbon adsorbents doped with 0.5 wt.% and 0.75 wt.% of H2O/THF, which was probably caused by the pore size difference during the adsorption and desorption steps.

Original languageEnglish (US)
Pages (from-to)8583-8588
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number20
DOIs
StatePublished - Oct 2009
Externally publishedYes

Keywords

  • Adsorption/desorption hysteresis
  • Hydrogen clathrate
  • Hydrogen storage
  • Ordered mesoporous carbon

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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