Thesis (M.Eng.)--Chulalongkorn University, 2004

To study the effect of types of the second elements added in zirconia synthesized by glycothermal method. It was found that occurrence of hydroxyl group depended on cationic size, positive result when small ionic size added. The morphologies of all products observed by SEM were spherical and secondary particle seems smaller the undoped zirconia. The crystallite size of all samples was not different and in values about 3 nm. High surface area was maintained when doping with small cationic size and the result in contrast when large cationic size added. The basic property and hydroxyl groups of zirconiz were improved consequently to much adsorption of carbondioxide when the second element added in appropriate quantity but this depened on cationic size, big ionic size give negative effect. The Zr3+ quantity was increased markedly when big ionic size such as lead and bismuth added.