Development of Advanced Column Material for Hydrogen Isotope Separation at Room Temperature

Ueda, Satoshi; Nanjou, Y.; Itoh, Takeshi; Tatenuma, Katsuyoshi; Matsuyama, Masao; Watanabe, Kuniaki

doi:10.13182/fst02-a22763

Cited by 4 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Pd-Cu alloys (4,8,10,15, and 25 at.%Cu as nominal composition) were prepared from the raw materials employing an arc melting method. They will be denoted hereafter as Pd-4Cu, -8Cu, -10Cu, -15Cu and -25Cu for simplicity.…”

Section: Methodsmentioning

confidence: 99%

“…Among the Pd-Cu alloys examined in this study, thermodynamic parameters for Pd15Cu alloy were almost equivalent to those for Pd-8at.%Pt alloy: DH 0 for absorption of H 2 and D 2 was À29.4 and À26.4 kJ/mol(Q 2 ), and that for desorption of H 2 and D 2 was 30.7 and 28.3 kJ/ mol(Q 2 ), respectively. It is known that this alloy has good performance for separation of a hydrogen isotope mixture near room temperature [10]. It is suggested, therefore, that Pd-15Cu alloy is a promising candidate for an alternative material to Pd-Pt alloys.…”

Section: Thermodynamic Parameters Such As Dh 0 and Dsmentioning

confidence: 99%

See 1 more Smart Citation

Applicability of Pd–Cu alloy to self-developing gas chromatography of hydrogen isotopes

Matsuyama

Sugiyama

Hara

et al. 2007

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Section: Thermodynamic Parameters Such As Dh 0 and Dsmentioning

confidence: 99%

Applicability of Pd–Cu alloy to self-developing gas chromatography of hydrogen isotopes

Matsuyama

Sugiyama

Hara

et al. 2007

Journal of Nuclear Materials

Self Cite

View full text Add to dashboard Cite

“…However, most of these techniques have low selectivity for separating hydrogen isotopes. More recently, Matsuyama et al , developed and applied a new separation technique for the separation of hydrogen isotopes, called self-developing gas chromatography. The advantages of this method are operation near room temperature and high efficiency of separation.…”

Section: Introductionmentioning

confidence: 99%

Cryogenic Separation of Hydrogen Isotopes in Single-Walled Carbon and Boron-Nitride Nanotubes: Insight into the Mechanism of Equilibrium Quantum Sieving in Quasi-One-Dimensional Pores

2008

View full text Add to dashboard Cite

Quasi-one-dimensional cylindrical pores of single-walled boron nitride and carbon nanotubes efficiently differentiate adsorbed hydrogen isotopes at 33 K. Extensive path integral Monte Carlo simulations revealed that the mechanisms of quantum sieving for both types of nanotubes are quantitatively similar; however, the stronger and heterogeneous external solid-fluid potential generated from single-walled boron nitride nanotubes enhanced the selectivity of deuterium over hydrogen both at zero coverage and at finite pressures. We showed that this enhancement of the D(2)/H(2) equilibrium selectivity results from larger localization of hydrogen isotopes in the interior space of single-walled boron nitride nanotubes in comparison to that of equivalent single-walled carbon nanotubes. The operating pressures for efficient quantum sieving of hydrogen isotopes are strongly depending on both the type as well as the size of the nanotube. For all investigated nanotubes, we predicted the occurrence of the minima of the D(2)/H(2) equilibrium selectivity at finite pressure. Moreover, we showed that those well-defined minima are gradually shifted upon increasing of the nanotube pore diameter. We related the nonmonotonic shape of the D(2)/H(2) equilibrium selectivity at finite pressures to the variation of the difference between the average kinetic energy computed from single-component adsorption isotherms of H(2) and D(2). In the interior space of both kinds of nanotubes hydrogen isotopes formed solid-like structures (plastic crystals) at 33 K and 10 Pa with densities above the compressed bulk para-hydrogen at 30 K and 30 MPa.

show abstract

“…[1][2][3] The property of Pd-Pt alloys is especially useful for the separation of hydrogen isotopes and has been successfully applied for an advanced gas chromatography for hydrogen isotope separation around room temperature without using any replacement gas. [4][5][6] It is reported in our previous papers 7,8) that the heat of hydrogen absorption as well as hydride formation decreases with increasing platinum-content in the alloy. On the other hand, the thermodynamic isotope effect on hydrogen absorption measured by the ratio of equilibrium pressures between protium and deuterium are almost invariable despite the change in the alloy composition.…”

Section: Introductionmentioning

confidence: 93%

Kinetics of Hydrogen Isotope Absorption for Well-Annealed Palladium-Platinum Alloys

et al. 2007

Self Cite

View full text Add to dashboard Cite

Absorption kinetics of protium and deuterium for Pd, Pd-4 at%Pt and Pd-8 at%Pt were studied in a dilute hydrogen concentration region in a temperature region from 274 to 357 K by means of constant volume method, where samples were annealed well at 973 K under vacuum before measurements to remove defects induced by sample preparation. It was found that protium had larger rate constants for adsorption, lower rate constants for desorption and larger diffusion constants than those of deuterium within the examined temperature region. The activation energy of hydrogen absorption for both hydrogen isotopes was almost null for all of the samples used. The activation energy of desorption for deuterium was smaller than that for protium. It was attributed to the difference in the enthalpy of hydrogen absorption into metal in dilute hydrogen concentration region between protium and deuterium. These features and trends observed in the alloying effect were supported by the ab initio calculations for small clusters.

show abstract

Development of Advanced Column Material for Hydrogen Isotope Separation at Room Temperature

Cited by 4 publications

References 6 publications

Applicability of Pd–Cu alloy to self-developing gas chromatography of hydrogen isotopes

Applicability of Pd–Cu alloy to self-developing gas chromatography of hydrogen isotopes

Cryogenic Separation of Hydrogen Isotopes in Single-Walled Carbon and Boron-Nitride Nanotubes: Insight into the Mechanism of Equilibrium Quantum Sieving in Quasi-One-Dimensional Pores

Kinetics of Hydrogen Isotope Absorption for Well-Annealed Palladium-Platinum Alloys

Contact Info

Product

Resources

About