In Situ Immobilization of Ultrafine Particles Synthesized in a Water/Oil Microemulsion.
We investigated the in situ immobilization of ultrafine particles synthesized in a water/oil (w/o) microemulsion to silica for its possible application to supported metal catalysts. ZnS particles immobilized to silica by the ME method were consistent with those synthesized in a w/o microemulsion. Therefore, ZnS particles in a w/o microemulsion could be immobilized to silica without aggregation by this method. The relationship between the method of synthesizing Rh ultrafine particles in a w/o microemulsion and the diameter and diameter distribution of Rh particles immobilized to silica was studied. Rh-SiO(2) catalysts with a sharp diameter distribution could be prepared by immobilizing Rh-hydrazine complex particles because these complex particles would be very stable in a w/o microemulsion. The Rh particle diameters of Rh-SiO(2) catalysts prepared by changing the amount of silica produced were almost identical. Accordingly, the Rh particle diameter of Rh-SiO(2) catalysts could be controlled independently of Rh content by the ME method. Copyright 2001 Academic Press.
Biomass Division, National Institute for Resource and Environment, 16-3 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan
Toshiaki
T
Hanaoka
Hiroki
H
Hayashi
Teruoki
T
Tago
Masahiro
M
Kishida
Katsuhiko
K
Wakabayashi