Pd/Al2O3催化剂的高温热烧结研究

以汽车尾气净化催化剂为背景，用溶胶－凝胶法和浸渍法制备了低负载量贵金属单钯燃烧催化剂。通过ＸＲＤ宽化法检测了在１２７３Ｋ的模拟反应气流中烧结２４ｈ后催化剂上Ｐｄ晶粒大小的变化。

STUDIES ON SEVERE THERMAL AGEING OF Pd/Al 2O 3 CATALYSTS

Both sintering and catalytic behaviour of noble Pd catalysts, which were prepared by impregnation and Sol Gel techniques and aged in a simulated exhaust gas, were investigated. While, an order of sintering for the Pd particles on aged catalysts has been obtained by the wide angle diffraction patterns. It was found that the Pd particles could be anchored within the relatively stable alumina host structure by Sol Gel methods and resulted in elevation of thermal stability and catalytic activity for CO oxidation of aged samples. In addition, the kinetic studies showed that the sintering mechanisms were different with the various preparation methods. It was confirmed that the preparation methods largely contributed to the thermal stability of the catalysts and it was important for exploring the thermostable supported catalysts such as those for the purification of automotive exhaust gas.