Effect of Addition of Divalent Transition Metal Chlorides on the Structure and Thermal Stability of Lamellar Silica Synthesized by the Neutral Amine Route

✍ Scribed by Robson F. de Farias; Claudio Airoldi

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 201 KB
• Volume: 149
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8504

✦ Synopsis

The addition of divalent metal chlorides MCl 2 (M ‫؍‬ Mn, Co, Ni, Cu, Zn, Cd, Hg) drastically a4ects the structure and thermal stability of lamellar silica obtained through the neutral amine route using 1,12-diaminedodecane as template molecule. These changes in properties are related to the coordination features, as well as the amount of cation employed. The enhancement of the thermal stability of the modi5ed lamellar silica is always independent of the cation added. On the other hand, the thermal stability of the hexagonal phase decreased. The occurrence of structural changes can be attributed to the reorientation of 1,12-diaminedodecane chains to allow cation coordination through nitrogen atoms.