Al-Pillared saponites. Part 1.—IR studies

Autor:	Sophie Chevalier, Jean-François Lambert, H. Suquet, Denise Barthomeuf, Raymonde Franck
Rok vydání:	1994
Předmět:	chemistry.chemical_compound chemistry Polymer chemistry Pyridine Inorganic chemistry engineering Molecule Infrared spectroscopy Pyridinium Saponite Physical and Theoretical Chemistry engineering.material Brønsted–Lowry acid–base theory
Zdroj:	J. Chem. Soc., Faraday Trans.. 90:667-674
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9949000667
Popis:	Al-Pillared saponites have been prepared from natural Na-exchanged Ballarat saponite. Acidic properties of these saponites have been studied by IR spectroscopy using pyridine as a probe molecule. Al-Pillared saponites exhibit both Bronsted and Lewis acidity. Lewis sites are evidenced in the parent Na-exchanged clay as well as in the pillared clays. Bronsted acid sites are not evidenced in the parent Na-exchanged saponite but Al-pillared saponites exhibit Bronsted acidity as shown by a pyridinium band at 1549 cm–1. Bronsted acid sites have been related to OH groups at 3740–3720 cm–1 and 3597–3594 cm–1. The same wavenumbers are evidenced for ν(OH) stretchings in acidified saponite and in Al-pillared saponites. It is assumed that an acidic attack of Si—O—Al linkages which may provide Bronsted sites occurs on the clay sheets during the pillaring process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ae438679b1ca29071566ca169e7ed834 https://doi.org/10.1039/ft9949000667 Zobrazit plný text záznamu