Characterization of Spanish sepiolites by high-resolution solid-state NMR

✍ Scribed by M.A. Aramendía; V. Borau; C. Jiménez; J.M. Marinas; J.R. Ruiz

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 544 KB
• Volume: 8
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/s0926-2040(97)00009-x

✦ Synopsis

29Si NMR (MAS and CP/MAS) and 'H MAS NMR techniques were used to characterize four sepiolites, two of natural origin (commercialized under the names Pangel and Pansil) and the other two obtained from them by treatment with 2 M or 4 M H,SO,, respectively. These techniques were used to identify the structural and surface changes undergone by sepiolites by the effects of acid treatment and calcination. Various types of Si were detected; also, treatment with 4 M H,SO, destroyed the sepiolite and produced fibrous silica. 0 1997 Elsevier Science B.V.