【作者】 楼狄明； 决坤有； 冯谦； 谭丕强； 胡志远；

【Author】 Lou Diming;Jue Kunyou;Feng Qian;Tan Piqiang;Hu Zhiyuan;School of Automotive Studies,Tongji University;

【机构】 同济大学汽车学院；

【摘要】 采用等体积浸渍法制备了掺杂不同双金属氧化物助剂的催化型颗粒物捕集器（CDPF）样品,通过X射线衍射、X射线光电子能谱技术对样品进行了表征,同时采用程序升温的方法对CDPF小样品进行活性评价。结果表明,掺杂CeO₂+ZrO₂的A2样品较掺杂Fe₂O₃+CeO₂的A1样品、ZrO₂+Fe₂O₃的A3样品晶胞参数最小,生成固溶体浓度最高,结晶度也最高。Fe-Ce双金属氧化物能够较好地促进Pt、Pd贵金属在载体表面的分散情况,并且能够更好地促进催化剂表面吸附氧浓度的提升,提高氧化活性。固溶体的生成可以提高氧空位浓度,但过高的氧空位浓度也会使得氧物种聚集,抑制气相反应物的吸附活化。较A2、A3样品,A1样品对CO、C₃H₈有更好的催化氧化效果,且其有更高的NO₂产率。更多还原

【Abstract】 The samples of catalytic diesel particulate filter（ CDPF） doped with different kinds of bimetal oxide promoters was prepared by equal volume impregnation method.The samples were characterized by X-ray diffraction and X-ray photoelectron spectroscopy,and the activity of CDPF was evaluated by temperature programmed method.The results showed that the A2 sample doped with CeO₂+ZrO₂ had the smallest unit cell parameters compared with A1 sample doped with Fe₂O₃+CeO₂ and A3 sample of ZrO₂+ Fe₂O₃,which had the highest solid solution concentration and the highest crystallinity.The Fe-Ce bimetal oxide could better promote the dispersion of Pt and Pd noble metals on the surface of the carrier,and could better promote the adsorption oxygen concentration on the catalyst surface and improve the oxidation activity.The formation of solid solution could increase the oxygen vacancy concentration,but the excessive oxygen vacancy concentration would also cause the oxygen species to aggregate and inhibit the adsorption and activation of the gas phase reactant.Compared with the A2 and A3 samples,the A1 sample doped with Fe₂O₃+CeO₂ had better catalytic oxidation effect on CO and C₃H₈,and it had higher NO₂ yield.更多还原