Synthesis of platinum over CeO2-Al2O3 by sequential-strong electrostatic adsorption method
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This research investigated the synthesis of platinum over mixed oxide of cerium-aluminum support using sequential-strong electrostatic adsorption (Seq-SEA). Platinum precursor is chloroplatinic acid (H2PtCl6). When it dissolves in water, it is in the form of PtCl62-. The maximal uptake of platinum complex was 0.42 μmol/m2 with the control of an initial pH of PtCl62- solution at 2.57 and surface loading of 1,000 m2/L. There were two experimental sets: set 1: no reduction of Pt before Seq-SEA (Seq-SEA set 1), and set 2: reduction of platinum before Seq-SEA (Seq-SEA set 2). The result showed that both sets of experiments platinum loading increased, as the number of Seq-SEA increased. Maximum Pt loadings after seq-SEA 4 times were 7.1% wt for Seq-SEA set 1, and 9.3% wt for Seq-SEA set 2. The prepared catalysts were identified the crystalline phases present in a material, revealed chemical composition information and determined an average crystalline size by X-ray Diffraction technique. The results indicated that Pt in the samples prepared by Seq-SEA set 1 with 1-3 Seq-SEA and Seq-SEA set 2 with 1-2 Seq-SEA was well dispersed. In the samples with 7.1%Pt loading prepared by Seq-SEA set 1, Seq-SEA set 2 and dry impregnation, average Pt crystalline sizes of each sample were 4.8, 4.7 and 5.1 nm, respectively. N2 adsorption-desorption technique was used for analyzing specific surface areas of all prepared samples. As Pt loadings increased, the specific surface areas decreased. Moreover, the results indicated that specific surface areas of the sample prepared by Seq-SEA set 1, Seq-SEA set 2 and dry impregnation with 7.1%Pt loading were different. There were 221.0, 227.0 and 207.7 m2/g, respectively, which were inversely correspond to an average Pt crystalline size.
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