Properties of the OH Groups in the Mg-Montmorillonite Structure Full article
Journal |
Chemical Papers
ISSN: 0366-6352 , E-ISSN: 1336-9075 |
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Output data | Year: 1982, Volume: 36, Number: 4, Pages: 515-522 Pages count : 8 | ||||
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Abstract:
Thermal decomposition and the acid-base properties of hydroxyl groups in Mg-montmorillonite were studied by thermoanalytical methods and i.r. spectroscopy. In the temperature range 200—700°C the OH groups of montmorillonite structure were characterized by five absorption bands with v(OH)/cm-1 = 3740, 3710, 3675, 3640, and 3595. Thermally most stable were the OH groups with v(OH) = 3675 and 3595 cm-1, the least stable those with v(OH) = 3710 cm-1. Acid-base properties of the OH groups were investigated by the adsorption of pyridine, deuterated ammonia, and benzonitrile vapours. It was found that on the surfaces of the investigated samples (heated at various temperatures in the interval 200—700°C) strong protonic centres are absent, or unattainable for larger molecules. Only the most stable OH groups of the structure in configurations Al—OH—Al and Al—OH—Mg manifested a certain acidity, sufficient for the protonization of ammonia. The formation of pyridine and benzonitrile donor-acceptor complexes took place via surface Mg2+ ions mainly after the heat treatment at 500—600°C.
Cite:
Horvath I.
, San'ko E.S.
, Paukshtis E.A.
, Yurchenko E.N.
Properties of the OH Groups in the Mg-Montmorillonite Structure
Chemical Papers. 1982. V.36. N4. P.515-522. WOS РИНЦ
Properties of the OH Groups in the Mg-Montmorillonite Structure
Chemical Papers. 1982. V.36. N4. P.515-522. WOS РИНЦ
Dates:
Submitted: | Sep 30, 1981 |
Identifiers:
Web of science | WOS:A1982PH39200009 |
Elibrary | 41754809 |
Chemical Abstracts | 1982:569505 |
Chemical Abstracts (print) | 97:169505 |