Study On Low Noble Metal Pt/Rh Monolithic Catalysts For Small Gasoline Engines Exhausts Purification

This paper studied the supports material of small gasoline engine exhausts purification catalysts and the small gasoline engine exhausts purification catalysts itself in detail. Based on the two kinds of prepared catalysts supports of series Ce0.3+xZr0.6-xY0.1O1.95 oxygen storage material and La stabilized Al2O3, the effects of Ce/Zr ratio on the property of surface area (BET), pore size, pore volume, oxyen storage capacity, cerium atom utilization, thermal stability, material structure and surface property of the series OSM Ce0.3+xZr0.6-xY0.1O1.95 was studied in detail. And the effects of Ce/Zr ratio on the property of temperature character, A/F character, catalysts structure and thermal stability of the series catalysts was also studied by different routine in detail. At last a kind of high performance low nobl metal small gasoline exhaust purification catalysts was prepared.A series oxygen storage material of Ce0.3+xZr0.6-xY0.1O1.95 and La-Al2O3 were prepared by co-precipitation routine and the property of these materials was studied by means of surface area (BET), oxygen storage capacity (OSC), temperature program reduction (H2-TPR), X-ray diffraction (XRD), transmission electronic microscope (TEM), and X-ray photoelectron spectroscopy (XPS). The BET results indicated that the fresh La-Al2O3 possessed high surface area, lage pore volume and reasonable pore size distribution. After high temperature ageing, La-Al2O3 showed high thermal stability, and low Ce/Zr ratio material was more thermal stable than high Ce/Zr ratio material. The OSC and TPR results indicated that the Ce/Zr ratio had great effection on the property of oxygen storage capacity, cerium atom utilization ratio, reducibility and thermal stability. Low Ce/Zr ratio material...