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

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90113-9· OSTI ID:7197558

Mentzen, B F; Favre, R; Cauwet, F ^[1]

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1. 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), Journal Name: Materials Research Bulletin; (United States) Vol. 29:6; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALCOHOLS
COHERENT SCATTERING
CONFIGURATION INTERACTION
DIFFRACTION
HYDROXY COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METHANOL
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
PORE STRUCTURE
SCATTERING
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
X-RAY DIFFRACTION
ZEOLITES