氧化铝孔结构特征对Pd基催化剂性能的影响

Influences of Alumina Pore Structure Character on Properties of Pd-Based Catalyst

摘要:

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：134.691 m2·g-1，孔容：0.5851 cm3·g-1，孔径：8.6877 nm，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

Abstract:

Pore structural parameters of 2 kinds of alumina before and after modification were reported, and with the modified alumina as coating Pd-based catalysts were prepared. The results show that the modified Al2O3-02 has specific area of 134.691 m2·g-1 and pore structure of 0.5851 cm3·g-1 and 8.6877 nm. The obtained Pd-based catalyst TWC-02 has superior properties. After calcining the catalyst at 950 oC, Pd grains homogeneously disperse in the surface of modified Al2O3-02; even ≥1050 oC, the dispersity of Pd is still good. Alumina has the effect of structure promoter on Pd-based catalyst. The superiority of the structure character of Al2O3-02 is also proved by a light-off active test.