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

Content Provider	Springer Nature Link
Author	Floquet, Nicole Coulomb, Jean Paul Llewellyn, Philippe Andre, Gilles Kahn, Remi
Copyright Year	2005
Abstract	X-ray or neutron diffractograms of calcined MCM-41 samples are strongly modified during the sorption phenomenon. Intensity of the main (100) peak (I100) could undergo a non monotonous behaviour. At the sorption beginning I100 increases and I100 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 D2 adsorption in a MCM-41 (Ø = 25 Å) 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 D2 adsorption mechanism is proved to be more defined: at the low relative adsorption pressure D2 fills the wall voids and forms a layer on the rough wall surface. Then at the relative pressure of the capillary step, D2 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.
Starting Page	679
Ending Page	684
Page Count	6
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	11
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	MCM-41 porous structure neutron diffraction hydrogen sorption filling modes Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Transport Phenomena Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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