Hydrogen adsorption on ordered mesoporous carbons doped with pd, pt, Ni, and Ru

Dipendu Saha, Shuguang Deng

Research output: Contribution to journalArticle

127 Citations (Scopus)

Abstract

A soft-template synthesis and in situ doping were applied for dispersing transition metals palladium, platinum, nickel, and ruthenium on ordered mesoporous carbons as potential adsorbents for hydrogen storage. Three metal loadings (1, 5, and 10 wt %) on the carbons were obtained to study the effects of metal concentration on physical and chemical properties of the carbon adsorbents. The carbon adsorbents were characterized with TEM, XRD, Raman spectroscopy, and nitrogen adsorption apparatus for their physical and chemical properties, and evaluated for their hydrogen adsorption equilibria and kinetics at 298 K and hydrogen pressures up to 300 bar. The metal-doped carbons maintained the morphology of the pure ordered mesoporous carbon, although their specific surface area was significantly reduced. Hydrogen adsorption on the metal-doped carbons was enhanced by a factor 2.7-5.4 times over the pure carbon at hydrogen pressure of 800 Torr, and a factor of 1.38-3.69 at hydrogen pressure of 300 bar due to the spillover effect. Hydrogen adsorption on metal-doped carbons increases with metal loading for all metals except the Ni-doped carbons that showed a reverse trend. The 1 wt % Ni-doped carbon sample seems to be the best adsorbent for hydrogen adsorption; it adsorbs 0.13 wt % of hydrogen at 298 K and 800 Torr and 2.14 wt % of hydrogen at 298 K and 300 bar. Hydrogen adsorption/desorption hysteresis was observed in all metal-doped carbons, suggesting that part of the adsorbed hydrogen molecules/atoms did not spill over to the carbon surface and remained on the metal surface. AU metal-doped carbons had equally faster adsorption kinetics at 298 K, and the metal loadings did not affect the hydrogen adsorption kinetics.

Original languageEnglish (US)
Pages (from-to)12550-12560
Number of pages11
JournalLangmuir
Volume25
Issue number21
DOIs
StatePublished - Nov 3 2009
Externally publishedYes

Fingerprint

Hydrogen
Carbon
Adsorption
adsorption
Metals
carbon
hydrogen
metals
adsorbents
Adsorbents
chemical properties
Chemical properties
Kinetics
kinetics
Physical properties
physical properties
Ruthenium
dispersing
Hydrogen storage
Palladium

ASJC Scopus subject areas

  • Electrochemistry
  • Spectroscopy
  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Hydrogen adsorption on ordered mesoporous carbons doped with pd, pt, Ni, and Ru. / Saha, Dipendu; Deng, Shuguang.

In: Langmuir, Vol. 25, No. 21, 03.11.2009, p. 12550-12560.

Research output: Contribution to journalArticle

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abstract = "A soft-template synthesis and in situ doping were applied for dispersing transition metals palladium, platinum, nickel, and ruthenium on ordered mesoporous carbons as potential adsorbents for hydrogen storage. Three metal loadings (1, 5, and 10 wt {\%}) on the carbons were obtained to study the effects of metal concentration on physical and chemical properties of the carbon adsorbents. The carbon adsorbents were characterized with TEM, XRD, Raman spectroscopy, and nitrogen adsorption apparatus for their physical and chemical properties, and evaluated for their hydrogen adsorption equilibria and kinetics at 298 K and hydrogen pressures up to 300 bar. The metal-doped carbons maintained the morphology of the pure ordered mesoporous carbon, although their specific surface area was significantly reduced. Hydrogen adsorption on the metal-doped carbons was enhanced by a factor 2.7-5.4 times over the pure carbon at hydrogen pressure of 800 Torr, and a factor of 1.38-3.69 at hydrogen pressure of 300 bar due to the spillover effect. Hydrogen adsorption on metal-doped carbons increases with metal loading for all metals except the Ni-doped carbons that showed a reverse trend. The 1 wt {\%} Ni-doped carbon sample seems to be the best adsorbent for hydrogen adsorption; it adsorbs 0.13 wt {\%} of hydrogen at 298 K and 800 Torr and 2.14 wt {\%} of hydrogen at 298 K and 300 bar. Hydrogen adsorption/desorption hysteresis was observed in all metal-doped carbons, suggesting that part of the adsorbed hydrogen molecules/atoms did not spill over to the carbon surface and remained on the metal surface. AU metal-doped carbons had equally faster adsorption kinetics at 298 K, and the metal loadings did not affect the hydrogen adsorption kinetics.",
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