Gas/vapor adsorption in imogolite: A microporous tubular aluminosilicate
- Univ. of New Mexico, Albuquerque (United States)
- Univ. of New Mexico, Albuquerque (United States) Los Alamos National Lab., NM (United States)
- Sandia National Lab., Albuquerque, NM (United States)
- Univ. of New Mexico, Albuquerque (United States) Sandia National Lab., Albuquerque, NM (United States)
Imogolite is a structurally microporous tubular aluminosilicate with one-dimensional pore channels of a single diameter that may be varied between 0.6 and 1.0 nm depending on composition. With proper processing, imogolite tubes may be synthesized and aligned into macroscopic, densely-packed arrays yielding a porous solid exhibiting a high degree of microporosity which is oriented in a single dimension as demonstrated via SEM and TEM. [sup 29]Si MAS NMR indicates that with proper synthesis, essentially pure tube bundles may be obtained with very low concentrations of amorphous (nontubular) impurities as compared to purified natural imogolite. The microporous structure of natural and synthetic imogolite has been investigated by nitrogen adsorption at 77 K as a function of outgassing temperature. For synthetic samples, pore volumes are approximately 0.2 cm[sup 3]/g and the average pore diameter for the 100% Si samples is approximately 0.7 nm and is approximately 0.9 nm for the 50% Si/50% Ge sample. CO[sub 2] and CH[sub 4] adsorption at 273 K is measured over the pressure range of 0-800 Torr and uptake is influenced by tube diameter even though the surface area of the two synthetic samples is similar. 24 refs., 12 figs., 1 tab.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6250790
- Journal Information:
- Langmuir; (United States), Vol. 9:4; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ALUMINIUM SILICATES
POROSITY
CARBON DIOXIDE
ADSORPTION
METHANE
NITROGEN
ELECTRON MICROSCOPY
NUCLEAR MAGNETIC RESONANCE
ALKANES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
HYDROCARBONS
MAGNETIC RESONANCE
MICROSCOPY
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RESONANCE
SILICATES
SILICON COMPOUNDS
SORPTION
400201* - Chemical & Physicochemical Properties
360606 - Other Materials- Physical Properties- (1992-)