Transformation of layered polyoxometallate cluster salts into mesoporous materials
- Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemistry
A new approach to the formation of mesoporous materials has been developed, based on a two-step salt-gel'' synthesis, in which mesoporous aluminophosphates, galloaluminophosphates, and aluminosilicates have been created. The first step involves pre-organizing charged inorganic clusters (MO[sub 4]Al[sub 12](OH)[sub 24](H[sub 2]O)[sub 12][sup 7+], M = Al or Ga) into a layered mesoscopic material with oppositely charged organic surfactant molecules. In the second step, phosphate or silicate linker molecules are added, which diffuse through the cluster/surfactant salt, react with the clusters, and transform the layered precursor into a non-lamellar mesostructured material. Removal of the surfactant from the alumino- and galloaluminophosphates by anion-exchange and from the aluminosilicates by calcination results in mesoporous materials with BET surface areas up to 630, 455, and 431 m[sup 2]/g, respectively. Direct condensation by calcination of polyoxoaluminate cluster salts without additional linkers produces nanometer-sized one-dimensional strings.
- Sponsoring Organization:
- PFF; PETRESF; DOE; Packard Foundation, Los Altos, CA (United States); Petroleum Research Fund (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6192500
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 34:3; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Surfactant-assisted synthesis of mesoporous zirconia powders with high surface areas
Direct synthesis of acidic aluminosilicate mesoporous molecular sieves
Related Subjects
360601* -- Other Materials-- Preparation & Manufacture
360602 -- Other Materials-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM PHOSPHATES
ALUMINIUM SILICATES
DIFFUSION
GALLIUM COMPOUNDS
GALLIUM PHOSPHATES
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PORE STRUCTURE
SILICATES
SILICON COMPOUNDS
SOL-GEL PROCESS
SURFACE AREA
SURFACE PROPERTIES
SURFACTANTS