Sonochemical synthesis of mesoporous transition metal and rare earth oxides.
Straight-extended layered mesostructures based on transItion metal (Fe, Cr) and rare earth (Y, Ce, La, Sm, Er) oxides are synthesized by sonication for 3 h. After a longer period of sonication (6 h), hexagonal mesostructures based on Y- and Er-oxides are obtained. The surface areas of the Y-based hexagonal mesophases before and after extraction are 46.5, 256 m2/g, respectively. For Er-based hexagonal mesophases, the surface areas before and after extraction are 157 and 225 m2/g. The pore sizes after extraction are 5.0 and 2.2 nm for Y- and Er-based mesophases, respectively. Hexagonal mesostructures are also obtained for Zr-based material after sonication for 3 h and the hexagonal structure is still maintained after calcinations at 400 degrees C for 4 h, although the surface area is only 35 m2/g.
Wang
Yanqin
Y
Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel.
Yin
Lunxiang
L
Gedanken
Arahon
A
D002384:Catalysis; D019216:Metals, Heavy / Q000138:chemical synthesis* / Q000737:chemistry; D008674:Metals, Rare Earth / Q000138:chemical synthesis* / Q000737:chemistry; D008854:Microscopy, Electron; D013010:Sonication; D013696:Temperature; D013997:Time Factors; D014961:X-Ray Diffraction
D019216:Metals, Heavy; D008674:Metals, Rare Earth