Thermal stability of high-silica zeolites

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Kinet. Catal. (Engl. Transl.); (United States)

OSTI ID:7060723

Khusid, B L; Chukin, G D; Gullyev, C; Nefedov, B K

A study has been made of the breakdown of the framework of the high-silica zeolites TsVK-I, TsVK-XI, and TsVM using derivatography, IR spectroscopy, and high-resolution /sup 29/Si and /sup 27/Al NMR. It has been discovered that at a Na/sub 2/O/Al/sub 2/O/sub 3/ mole ratio < 1, all samples become amorphous at T > 1100/sup 0/C; the process begins with the breaking of the Al-O bonds and depends on the hydroxyl covering of the zeolite. For samples with Na/sub 2/O/Al/sub 2/O/sub 3/ > 1, breakdown of the lattice Si-O-Si bonds occurs at T < 1000/sup 0/C and depends on the degree of crystallization of the zeolite.

• Research Organization: All-Union Scientific-Research Institute for Oil Refining, Moscow (USSR)
• OSTI ID: 7060723
• Journal Information: Kinet. Catal. (Engl. Transl.); (United States), Journal Name: Kinet. Catal. (Engl. Transl.); (United States) Vol. 28:4; ISSN KICAA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical &amp; Physicochemical Properties
ALKALI METAL COMPOUNDS
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM OXIDES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
DECOMPOSITION
EVEN-ODD NUCLEI
GRAVIMETRIC ANALYSIS
HETEROGENEOUS CATALYSIS
HYDROGEN 1
HYDROGEN ISOTOPES
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MINERALS
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
SILICA
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SILICON OXIDES
SODIUM COMPOUNDS
SODIUM OXIDES
SPECTRA
STABLE ISOTOPES
TEMPERATURE EFFECTS
THERMAL ANALYSIS
THERMAL DEGRADATION
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
ZEOLITES