Abstract
In order to obtain a SiO2 layer as a catalyst support on a surface of aluminum, silica coating on an anodized aluminum plate has been investigated. The catalyst support plate was prepared by impregnating an anodized aluminum plate into silica sol and calcinating it. Results indicated that adding oxalic acid to silica sol is effective in increasing the amount of silica, but adding other acids to the sol form a gel within 100h. The amount of silica applied increases with an increase in the temperature and the impregnation time. However, the amount decreased as the amount of alumina layer that had dissolved increased. The BET surface area of the coated specimens increased as the Si content increased. The maximum surface area relative to the apparent geometrical surface area was approximately 6000m2·m-2, which was more than twice that before coating, demonstrating that it is possible to apply the coating as a catalyst support. Results of plate characterization indicated that the alumina layer formed by anodizing dissolved in the presence of oxalic acids enlarging the pores that were then filled with silica particles.
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