Issue 14, 2006

Sol-gel preparation of AlPO4–SiO2 glasses with high surface mesoporous structure

Abstract

Transparent and colorless amorphous silicaaluminum phosphate gels and glasses along the composition line, xAlPO4–(1−x)SiO2 were prepared via the sol-gel route using tetraethylorthosilicate (TEOS), aluminum lactate, and ammonium dihydrogen phosphate as precursors. The glass-forming range was significantly extended, compared with that accessible by previously reported routes. After calcination at 600 °C, the amorphous AlPO4–SiO2 material exhibits an attractive mesoporous structure with surface areas as high as 582 m2 g−1. With increasing gel-processing and conversion temperature, the average degree of P/Al connectivity increases, while the Q3 silicon units present in the gels are gradually converted to Q4 units. After sample calcination above 600 °C for 8 h, the NMR results indicate that the structure of the prepared materials is composed of AlPO4- and SiO2-nanodomains.

Graphical abstract: Sol-gel preparation of AlPO4–SiO2 glasses with high surface mesoporous structure

Supplementary files

Article information

Article type
Paper
Submitted
22 Nov 2005
Accepted
30 Jan 2006
First published
10 Feb 2006

J. Mater. Chem., 2006,16, 1323-1331

Sol-gel preparation of AlPO4–SiO2 glasses with high surface mesoporous structure

C. C. de Araujo, L. Zhang and H. Eckert, J. Mater. Chem., 2006, 16, 1323 DOI: 10.1039/B516599G

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