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考察2种γ-Al2O3改性前后的孔结构参数,并以改性氧化铝为涂层基体材料制备Pd基催化剂。结果表明,改性Al2O3-02具有比表面积:134.691m2·g-1,孔容:0.5851cm3·g-1,孔径:8.6877nm,且用其制备的Pd基催化剂TWC-02的性能较优越;该催化剂经950℃煅烧后,Pd均匀分散于改性Al2O3-02表面,甚至温度≥1050℃高温条件下煅烧后Pd的分散性仍较好。氧化铝对Pd基催化剂起到结构助催化作用,起燃活性评价试验也证实改性Al2O3-02的这一优越性能。
The pore structure parameters before and after the modification of two kinds of γ-Al2O3 were investigated, and the Pd-based catalyst was prepared by using modified alumina as the coating base material. The results showed that the modified Al2O3-02 has a specific surface area of 134.691m2 · g-1, a pore volume of 0.5851cm3 · g-1, a pore size of 8.6877nm, and the prepared Pd-based catalyst TWC-02 has superior performance. After the catalyst is calcined at 950 ° C, Pd is uniformly dispersed on the surface of the modified Al2O3-02. Even after the calcination at a temperature of ≥1050 ° C, the Pd dispersion is still good. Alumina plays a structural promoter role for Pd-based catalysts. The light-burn activity evaluation test also confirmed this superior performance of modified Al2O3-Al2O3.