Determination of external surface area of ultrahigh silica zeolites by the paramagnetic net methods
We propose a new method for determining the surface area of large-pore adsorbents which do not contain paramagnetic impurities: the paramagnetic net method. The method is based on determining the average distances between paramagnetic centers which are randomly and uniformly distributed over the adsorbent surface. As the paramagnetic probe, we use the stable nitroxide radical 2,2,6,6-tetramethyl-piperidine-1-oxyl. We show that the method is applicable to measurement of the external surface area of crystallites of ultrahigh silica zeolites. Decationation leads to its increase without an increase in the contribution of the amorphous phase. This effect is explained by dispersal of concretions of small crystallites during ion exchange.
- Research Organization:
- M. V. Lomonosov State Univ., Moscow (USSR)
- OSTI ID:
- 6869788
- Journal Information:
- Kinet. Catal. (Engl. Transl.); (United States), Vol. 28:4; Other Information: Translated from Kinet. Katal; 28: No. 4, 1002-1006(Jul-Aug 1988)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ZEOLITES
CATALYTIC EFFECTS
ELECTRON SPIN RESONANCE
PARAMAGNETISM
SORPTIVE PROPERTIES
SURFACE AREA
ADSORBENTS
ADSORPTION
AMORPHOUS STATE
CATALYSTS
CRYSTAL STRUCTURE
CRYSTALLIZATION
HETEROGENEOUS CATALYSIS
ION EXCHANGE
MAGNETIC DIPOLE MOMENTS
MATERIALS TESTING
NITROXYL RADICALS
PHASE STUDIES
SILICA
CATALYSIS
CHALCOGENIDES
DIPOLE MOMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MAGNETISM
MATERIALS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADICALS
RESONANCE
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SURFACE PROPERTIES
TESTING
400201* - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies