Synthesis of magnesium oxide by the sol-gel method: Effect of the pH on the surface hydroxylation

Magnesium oxide was prepared by the sol-gel method. The method involves the hydrolysis of magnesium alkoxide in the presence of acid or basic catalysts followed by a polycondensation reaction. The synthesized solids were characterized by IR spectroscopy, X-ray diffraction, DTA, TGA, and electron mic...

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Bibliographic Details
Published in:Journal of catalysis 1991, Vol.127 (1), p.75-85
Main Authors: Lopez, T., Garcia-Cruz, I., Gomez, R.
Format: Article
Language:English
Subjects:
02 PETROLEUM
020400 - Petroleum- Processing
400201 - Chemical & Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
ALKANES
AROMATICS
BENZENE
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
Chemistry
COHERENT SCATTERING
Colloidal state and disperse state
CYCLOALKANES
DECOMPOSITION
DEHYDROCYCLIZATION
DEHYDROGENATION
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELECTRON MICROSCOPY
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
GRAVIMETRIC ANALYSIS
HYDROCARBONS
HYDROGENATION
HYDROLYSIS
INFRARED SPECTRA
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LYSIS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SOL-GEL PROCESS
SOLVOLYSIS
SPECTRA
SPECTROSCOPY
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
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Description
Summary:Magnesium oxide was prepared by the sol-gel method. The method involves the hydrolysis of magnesium alkoxide in the presence of acid or basic catalysts followed by a polycondensation reaction. The synthesized solids were characterized by IR spectroscopy, X-ray diffraction, DTA, TGA, and electron microscopy. It is shown that the hydrolysis process depends on the catalyst's pH (HCl > CH 3COOH > H 2C 2O 4 > H 2O > NH 4OH). This effect can be explained by the reaction mechanism. The reaction is controlled by the hydrolysis at acid pH and by the polycondensation at a basic one. Solids prepared by this method are chemically homogeneous, very pure, and specifically hydroxylated. They can be widely used in the study of magnesium support effects in different catalytic reactions.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(91)90210-U