Characterization of guest molecules sorbed in zeolites of known structure; Part 6: Localization of methanol at several pore fillings in a highly siliceous MFI silicalite material
- Lyon-1 Univ., Villeurbanne (France). Lab. de Physicochimie Minerale IA
Structural investigations on a silicalite/methanol (MeOH) system by X-Ray powder diffraction and Rietveld profile refinements show that there are six possible adsorption sites for the methanol molecules. Those located in the channel-intersections (sites I--II and I-III[prime]) or in the zig-zag channel sections (sites I--II and I--II[prime]) form dimeric entities (maximum 4MeOH/uc concentrations for each of the corresponding four individual sorbate species) presenting intermolecular interactions comparable to those observed in the orthorhombic methanol crystal structure. The sorbed species in the straight-channel sections seem to be monomeric (maximum 2MeOH/us concentrations for each of these two species). The highest theoretical pore-filling amounts to 2 0MeOH/uc, in good agreement with the experimentally observed value ([approx] 1 9MeOH/uc). All the investigated silicalite/methanol complexes present the monoclinic P2[sub 1]/n[center dot]1[center dot]1 framework symmetry, which is an indication that there are no sorbate/sorbate or sorbate/silicalite interactions in or through the straight-channel sections.
- OSTI ID:
- 7197558
- Journal Information:
- Materials Research Bulletin; (United States), Vol. 29:6; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Understanding the unique sorption of alkane-α, ω-diols in silicalite-1
Flexibility of the MFI silicalite framework upon benzene adsorption at higher pore-fillings: A study by X-ray powder diffraction, NMR and molecular mechanics
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
METHANOL
ADSORPTION
ZEOLITES
SORPTIVE PROPERTIES
CONFIGURATION INTERACTION
PORE STRUCTURE
X-RAY DIFFRACTION
ALCOHOLS
COHERENT SCATTERING
DIFFRACTION
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
SCATTERING
SILICATE MINERALS
SORPTION
SURFACE PROPERTIES
400201* - Chemical & Physicochemical Properties