ChemInform Abstract: Al-Pillared Saponites. Part 1. IR Studies

Autor:	Jean-François Lambert, Sophie Chevalier, H. Suquet, Raymonde Franck, Denise Barthomeuf
Rok vydání:	2010
Předmět:	chemistry.chemical_compound chemistry Polymer chemistry Pyridine engineering Molecule Infrared spectroscopy General Medicine Saponite Pyridinium engineering.material Brønsted–Lowry acid–base theory
Zdroj:	ChemInform. 25
ISSN:	0931-7597
DOI:	10.1002/chin.199426023
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_________::2be32da69f8df0b124005244819b7016 https://doi.org/10.1002/chin.199426023 Zobrazit plný text záznamu Plný text