Hydrothermal modification of zirconia-silica gels
Porous materials based on the complex oxides SiO/sub 2/-ZrO/sub 2/ produced by various methods are of interest as acid-base catalysts and ion-exchangers. In this work the authors studied hydrothermal modification of the texture and phase composition of coprecipitated zirconia-silica gels. The porosity parameters were determined from the methanol and hexane vapor adsorption isotherms and by chromatography from thermal argon desorption. The crystal structure was studied by x-ray diffraction and derivatography. A substantial decrease of the specific surface and increases of the pore volume and size are the most common features of silicon-zirconium xerogels and precipitates of all compositions subjected to hydrothermal aging at elevated treatment temperatures.
- Research Organization:
- L. V. Pisarzhevskii Institute of Physical Chemistry (USSR)
- OSTI ID:
- 7159840
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 60:3; Other Information: Translated from Zh. Prikl. Khim.; 60: No. 3, 503-506(Mar 1987)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structural and optical properties of silver-doped zirconia and mixed zirconia-silica matrices obtained by sol-gel processing
Sol-gel processing of controlled porosity silica films: From aerogels to molecular sieves
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
SILICA GEL
CHEMICAL ACTIVATION
HEAT TREATMENTS
MICROSTRUCTURE
POROSITY
SORPTIVE PROPERTIES
ZIRCONIUM OXIDES
ADSORPTION ISOTHERMS
ARGON
CATALYSTS
CATALYTIC EFFECTS
DIFFERENTIAL THERMAL ANALYSIS
GAS CHROMATOGRAPHY
HEXANE
INORGANIC ION EXCHANGERS
METHANOL
PHASE STUDIES
SURFACE AREA
TEMPERATURE EFFECTS
X-RAY DIFFRACTION
ADSORBENTS
ALCOHOLS
ALKANES
CHALCOGENIDES
CHROMATOGRAPHY
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTS
FLUIDS
GASES
HYDROCARBONS
HYDROXY COMPOUNDS
ION EXCHANGE MATERIALS
ISOTHERMS
MATERIALS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE GASES
SCATTERING
SEPARATION PROCESSES
SURFACE PROPERTIES
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies