Structural analysis by neutron diffraction of simples gases(H2, Ar, CH4and CF4) sorbed phases in AIPO4-5.

Coulomb, J.P.; Martin, Céline; Grillet, Y.; Tosi-Pellenq, N.

doi:10.1016/s0167-2991(08)64144-0

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…Such interference effects can be constructive or destructive depending of the sorbate position in the mesopore and the (hkl) diffraction peak. Recall that the same phenomenon has been usually observed during the sorption in zeolites (Coulomb et al, 1994(Coulomb et al, , 1999Floquet et al, 2003).…”

Section: Resultssupporting

confidence: 67%

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Floquet

Coulomb

Llewellyn³

et al. 2005

Adsorption

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X-ray or neutron diffractograms of calcined MCM-41 samples are strongly modified during the sorption phenomenon. Intensity of the main (100) peak (I 100 ) could undergo a non monotonous behaviour. At the sorption beginning I 100 increases and I 100 strongly decreases in the medium and high loading regimes. These observed intensity modifications in the diffractograms are closely related to the MCM-41 sample and to the filling mechanisms of its porosity. Actually each synthesis produces MCM-41 sample with its own silica wall and porosity. Several MCM-41 structural models and adsorption filling modes were attempted to fit all the diffractograms recorded during the D 2 adsorption in a MCM-41 (Ø = 25Å) sample at T = 16.4 K. Our data agree with a MCM-41 having low density silica walls (20% voids) that is rarely reported. Consequently, the D 2 adsorption mechanism is proved to be more defined: at the low relative adsorption pressure D 2 fills the wall voids and forms a layer on the rough wall surface. Then at the relative pressure of the capillary step, D 2 fills the whole free MCM-41 mesopores. Even the solid capillary phase does not grow layer by layer on the inner pore walls but is growing up along the pore axis.

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Section: Resultssupporting

confidence: 67%

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Floquet

Coulomb

Llewellyn³

et al. 2005

Adsorption

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“…On the other hand, the micropore length L has a macroscopic value (on average L = 50 mm). Both the sorption properties of AlPO 4 -5 zeolite and the structural analysis of simple-gases sorbed phases (as for instance D 2 ) have already been investigated [15].…”

mentioning

confidence: 99%

Direct measurement of the translational mobility of deuterium hydride molecules confined in a model microporous material: AlPO ₄ -5 zeolite

1996

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We have measured by incoherent quasi-elastic neutron scattering the diffusion coefficient D t of sorbed hydrogen (HD) molecules in the one-dimensional micropore network of AlPO4-5 zeolite. The confined hydrogen phase in such nano-scale cylindrical tubes (diameter φ = 7.3 Å) behaves as a quasi-(1d) fluid phase. At temperature T = 19.5 K, in the medium loading regime (Θ 40%), the translational molecular mobility is quite large, D t = 0.45 • 10 −5 cm 2 s −1 . When increasing Θ, Dt strongly decreases down to 0.03 • 10 −5 cm 2 s −1 (Θ 95%). At lower temperature T = 10.3 K, the HD molecular mobility is still important, Dt = 0.15 • 10 −5 cm 2 s −1 at Θ 40%.

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Structural Analysis by Neutron Diffraction of Nitrogen Sorbed Phases on Silicalite I and ZSM-5 (Si / Al = 23) Zeolites

Coulomb¹,

Llewellyn²,

Martin³

et al. 1996

The Kluwer International Series in Engineering and Computer Science

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Structural analysis by neutron diffraction of simples gases(H2, Ar, CH4and CF4) sorbed phases in AIPO4-5.

Cited by 7 publications

References 5 publications

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Direct measurement of the translational mobility of deuterium hydride molecules confined in a model microporous material: AlPO ₄ -5 zeolite

Structural Analysis by Neutron Diffraction of Nitrogen Sorbed Phases on Silicalite I and ZSM-5 (Si / Al = 23) Zeolites

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Structural analysis by neutron diffraction of simples gases(H2, Ar, CH4and CF4) sorbed phases in AIPO4-5.

Cited by 7 publications

References 5 publications

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Growth Mode of Hydrogen in Mesoporous MCM-41. Adsorption and Neutron Scattering Coupled Studies

Direct measurement of the translational mobility of deuterium hydride molecules confined in a model microporous material: AlPO 4 -5 zeolite

Structural Analysis by Neutron Diffraction of Nitrogen Sorbed Phases on Silicalite I and ZSM-5 (Si / Al = 23) Zeolites

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Direct measurement of the translational mobility of deuterium hydride molecules confined in a model microporous material: AlPO ₄ -5 zeolite