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| 1 | Size effect of Pt nanoparticles in acid-assisted soot oxidation in the presence of NO显示文摘Pt/Al2O3 catalysts with mean Pt particle size ranged from 2.7 to 7.1 nm were synthesized by chemical reduction method,and the sulfated counterparts were prepared by impregnation of sulfuric acid.The turnover frequency of platinum for soot oxidation under loose contact conditions in a feed flow containing NO and O2 are positively correlated with the size of platinum.The sulfated Pt/Al2O3 exhibits higher catalytic activity for soot oxidation in the presence of NO despite their reduced ability for NO2 production.Such a contradiction is more significant for those catalysts with smaller platinum particles.Herein,the catalysts were characterized by X-ray diffraction(XRD),Brunauer-Emmett-Teller(BET),transmission electron microscopy(TEM),inductive coupled plasma(ICP)emission spectrometry,CO chemisorption,thermogravimetric analysis(TGA),NH3 temperature-programmed desorption(NH 3-TPD),NO temperature-programmed oxidation(TPO)and NO x temperatureprogrammed desorption(TPD).Possible effect of Pt particle size for the catalytic oxidation of soot in the presence of NO was presented based primarily on the promoted NO2 transfer efficiency onto the soot pushed by the acidic catalysts. | Shuting Luo Xiaodong Wu Baofang Jin Shuang Liu Rui Ran Zhichun Si Duan Weng | 2020 | Journal of Environmental Sciences2020，32，8： | 1 |
| 2 | 重型载货车用柴油机减量增效氧化催化器的开发显示文摘在世界范围内不断采取更为严格的法规标准来控制重型载货车辆排放,同时,在改善燃油经济性的要求下极大降低了排气温度,并显著增加了当前氧化催化转化器(DOC)中贵金属(PGM)的使用。因此,需设计开发超低含量的PGM和复合金属氧化物(MMO)协同作用下的增效贵金属(SPGM),从而高效改善柴油机排放性能。SPGM中的MMO将NO氧化成NO_2,转化的NO_2对下游捕集器被动再生功能和选择性催化转化器(SCR)功能至关重要。作为初步研究,阐述了目前DOC应用中MMO的开发,并提出该应用中存在的一些特殊挑战。该研究中实验室和连续反应器的数据表明,在SPGM DOC具有耐热性能,对硫的毒化作用具有较好的耐受力。此外,与原始设备制造商(OEM)的基准DOC相比,温度大于250℃时,减量PGM的SPGM DOC的NO_2产出量增加。研究示出了SPGM DOC的发动机台架试验结果、瞬态试验结果和道路试验结果,并与OEM DOC进行了对比。发动机台架试验表明,在PGM负载量显著降低的情况下,NO_2产出量增多。道路试验表明,重型DOC和捕集器系统转向SPGM后,系统特性并无变化或恶化。道路试验现场数据记录表明,相同的主动再生标定具有相同的放热曲线,从而等同于柴油机颗粒捕集器(DPF)再生。在道路重型载货车辆应用中,SPGM DOC CO和碳氢化合物(HC)转化充分、优先生成NO_2。但是SPGM DOC的开发仍存在特殊挑战,正在对基于MMO的形成和机制进行研究。 | Z.Nazarpoor S.Golden M.Launois S.Kitazumi D Y Xie C.McConell 高英英 | 2018 | 汽车与新动力2018，1，2： | 0 |
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