Formation of clathrate hydrates in hydrogen-rich gases

Holder, Gerald D.; Stephenson, Jerry L.; Joyce, Jeffery J.; John, Vijay T.; Kamath, V.A.; Malekar, Shirish T.

doi:10.1021/i200020a029

Cited by 31 publications

(35 citation statements)

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“…Historically it was thought that the hydrogen molecule was too small to contribute to the stability of these compounds and H 2 was thought to act as a diluent to the fugacity of other components in gas stream mixtures [2]. Over the past six years it has been established that hydrogen can act as a suitable hydrate guest molecule in both single and mixed hydrates [3,4].…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopic studies of hydrogen clathrate hydrates

Strobel

Sloan

Koh

2009

The Journal of Chemical Physics

132

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Raman spectroscopic measurements of simple hydrogen and tetrahydrofuran+hydrogen sII clathrate hydrates have been performed. Both the roton and vibron bands illuminate interesting quantum dynamics of enclathrated H(2) molecules. The complex vibron region of the Raman spectrum has been interpreted by observing the change in population of these bands with temperature, measuring the absolute H(2) content as a function of pressure, and with D(2) isotopic substitution. Quadruple occupancy of the large sII clathrate cavity shows the highest H(2) vibrational frequency, followed by triple and double occupancies. Singly occupied small cavities display the lowest vibrational frequency. The vibrational frequencies of H(2) within all cavity environments are redshifted from the free gas phase value. At 76 K, the progression from ortho- to para-H(2) occurs over a relatively slow time period (days). The rotational degeneracy of H(2) molecules within the clathrate cavities is lifted, observed directly in splitting of the para-H(2) roton band. Raman spectra from H(2) and D(2) hydrates suggest that the occupancy patterns between the two hydrates are analogous, increasing confidence that D(2) is a suitable substitute for H(2). The measurements suggest that Raman is an effective and convenient method to determine the relative occupancy of hydrogen molecules in different clathrate cavities.

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Section: Introductionmentioning

confidence: 99%

Raman spectroscopic studies of hydrogen clathrate hydrates

Strobel

Sloan

Koh

2009

The Journal of Chemical Physics

132

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“…Historically the hydrogen molecule was considered to be too small to contribute to the stability of clathrate hydrates [4,5]. That is, in gas mixtures containing hydrogen, hydrogen was thought to be a diluent for other natural gas components rather than a hydrate forming molecule.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of clathrate hydrate materials

Strobel

Koh

Sloan

2007

Fluid Phase Equilibria

189

142

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“…Hydrogen molecules were historically considered to be too small to stabilize the structures of clathrate hydrates [15]. However, in 1999, Dyadin et al [16] discovered for the first time that hydrogen can form clathrate hydrates at high pressures (up to 1.5 GPa).…”

Section: Hydrogen Clathrate Hydratementioning

confidence: 99%

Clathrate Hydrates

Shariati¹,

Raeissi²,

Peters³

2010

Handbook of Hydrogen Storage

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Hydrogen fuel, if provided via a green method, is renewable and environmentally friendly. However, the lack of practical storage methods has restricted its use to such an extent that hydrogen storage is currently a crucial obstacle in the development of a hydrogen economy. The challenge, particularly for mobile applications, is that the hydrogen storing system needs to be lightweight and compact. The two most popular methods currently being used are the storage of hydrogen as compressed gas under high pressures, or as a cryogenic liquid. To approach the goals required to develop a hydrogen economy, researchers are investigating a range of different techniques.A practical hydrogen storage method must satisfy a number of requirements [1]:1) high hydrogen content per unit mass 2) high hydrogen content per unit volume 3) moderate synthesis pressure (preferably less than 400 MPa, the pressure that can be reached by a simple compressor) 4) near ambient pressure and moderate temperature for storage 5) fast and efficient hydrogen release 6) environmentally friendly byproducts, if any.The most common ways of storing hydrogen fuel as liquid hydrogen and compressed hydrogen gas have the drawbacks that the fuel needs to be stored at extremely low temperatures (20 K for liquid hydrogen) or at high pressures (35 MPa for compressed hydrogen) [2]. To overcome such issues, much attention is currently being given to storing hydrogen in solid-state materials. Recently emerging materials include doped carbon-based nanostructures [3], metal organic frameworks [4], metallic hydrides [5], complex hydrides and destabilized hydrides [6, 7]. However, no material so Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Formation of clathrate hydrates in hydrogen-rich gases

Cited by 31 publications

References 1 publication

Raman spectroscopic studies of hydrogen clathrate hydrates

Raman spectroscopic studies of hydrogen clathrate hydrates

Hydrogen storage properties of clathrate hydrate materials

Clathrate Hydrates

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