The adsorption of KCN,KOCN and KSCN onto silica gel: Chemisorption vs. physisorption |
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| Institution: | 1. Université Libre de Bruxelles, 4MAT Department, CP165/63, Avenue F. Roosevelt 50, B-1050 Brussels, Belgium;2. Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Sorbonne Universités, UPMC Univ Paris 06, CNRS UMR 7590, Muséum national d''Histoire naturelle, IRD UMR 206, 4 place Jussieu, F-75005 Paris, France;3. AGC Glass Europe, Technovation Centre, Rue Louis Blériot 12, B-6041 Gosselies, Belgium;4. Synchrotron SOLEIL, L''Orme des Merisiers 48, St Aubin, 91192 Gif-sur-Yvette Cedex, France;1. Laboratory for High Performance Ceramics, Department of Metallurgical and Materials Engineering, Indian Institute of Technology-Madras (IIT Madras), Chennai 600036, India;2. Univ. Limoges, CNRS, IRCER, UMR 7315, F-87000 Limoges, France;3. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Universite Montpellier, Place E. Bataillon, F-34095 Montpellier, France |
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| Abstract: | 29Si magic angle spinning NMR, and i.r. spectroscopy have been used to study the adsorption of KCN, KOCN and KSCN onto silica gel. KCN and KOCN chemisorb, forming Si-OCN groups at the silica surface, whereas KSCN is physisorbed. KCN-silica and KOCN-silica show a peak at −99 ppm in the 29Si NMR spectrum, and a broad band at 2300 cm−1 in the i.r. spectrum; these features are absent in the spectra of KSCN-silica. |
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