汽车排气净化催化剂综合性能的研究

COMPREHENSIVE CHARACTERIZATION OF RARE EARTH COMPLEX OXIDES CATALYST FOR AUTO-EXHAUST TREATMENT

对HR-1型稀土复合氧化物催化剂进行了活性评价,实验结果表明,该催化剂具有良好的温度和空速特性,耐高温性能好;经60000km行车使用后,催化剂仍保持良好的活性;对行车后的催化剂进行了综合分析,说明HR-1型催化剂在一定程度上能够经受燃油带入的铅、磷、锌等物质的侵袭;高温热冲击所造成的催化剂比表面的减少乃是催化剂性能降低的主要原因.

The CO and HC oxidation activity of HR-1 type rare earth complex oxides catalyst was tested using artificial blended gas and exhaust gases from gasoline engine of model F170-1. The catalyst performed well under a wide range of temperature (up to 1000℃) and space velocity. The activity of the catalyst last for 60 000km mileage testing. The results of a series of analysis on CO oxidation activity, specific surface area, elementary composition, X-ray diffraction and scanning electron microscope showed that the catalyst can tolerate the contaminants from fuel oil additives, such as Pb,P, S and Zn compounds, to certain extent. The high temperature impact of the hot gas-flow on the HR-1 catalyst is the main reason for the partial reduction of the catalyst activity.