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This paper reports the investigation of the physical and chemical characteristics of the prepared 3Pt-2MgO-3ZrO₂-2CeO₂/Al₂O₃ DOC, based on its hydrothermal aging. As a result of impregnating and reducing the H₂PtCl 6 ㆍ6H₂O precursor on a γ-Al₂O₃ basis, it was well dispersed into small particles with the range 2-3nm. This was because the Al₂O₃ acted as a barrier to prevent movement of the catalyst particles. For a hydrothermally aged catalyst for 9h at 700℃, its performance when purifying harmful gases decreased compared to a fresh catalyst, but its specific surface area was at the same level. This was because the performance of the catalyst was reduced by the sintering of the precious metal Pt, rather than by washcoat sintering and pore clogging. For an excessively hydrothermally aged catalyst for 9h at 850℃, Pt grew into an approximately 50nm class, formed a cluster compared to a fresh catalyst. The CeO₂ promoters also formed clusters among components of the same type, reducing their specific surface area to 114㎡/g, which was 14% less than a fresh catalyst.

Physicochemical Characteristics Based on Hydrothermal Aging of Prepared DOC