Study On The Three-way Catalysts For Exhaust Gases Purification Of Motorcycle

In this paper, the preparation technology of oxygen storage material has been studied in detail. The property of the oxygen storage material and the effect of different oxygen storage material on the performance of three-way catalysts about purifying the motorcycle exhaust gases were also studied by different ways. Based on the best preparation condition of oxygen storage material, the performance of catalysts was systematically studied, including the properties of temperature character, air/fuel ratio, reducibility and thermal stability of three-way catalysts. At last, a kind of high performance motorcycle exhaust gases purification three-way catalysts which could be satisfied with the EU-III emission control regulation was prepared.Through the study of preparation condition and property of different oxygen storage material, it was found that when the PH was controlled at 10 and the salvolatile and ammonia mixed solution was used as precipitator, the four components oxygen storage material (Ce-Zr-Y-La) possessed the better structural property. The light-off temperature of the catalyst containing Ce-Zr-Y-La for HC, NO and CO conversion was 240℃, 190℃, and 243℃, respectively. Aging at 1000℃for 5h, the light-off temperature for HC, NO and CO conversion was300℃, 220℃, and 243℃, respectively. This result showed that the catalyst was high thermal stability. The investigation of results about Ce/Zr ratio on the property of four component oxygen storage material (Ce-Zr-Y-La) showed that the catalyst had the best thermal stability and three-way work window when the Ce/Zr ratio was 1.Through the elementary investigation of the only Pd catalyst, Pd had different dispersion on the oxygen storage materials which was calcined at different...