Comparative activity and hydrothermal stability of FeOx- and CeO2-doped Pt-based catalysts for eliminating diesel emissions
Comparative activity and hydrothermal stability of FeOx- and CeO2-doped Pt-based catalysts for eliminating diesel emissions
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DOI：
10.1016/j.jece.2020.104361
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发表时间：
2020-10
影响因子：
7.7
通讯作者：
Yanli Liang;Xinmei Ding;Jianli Wang;Ming Zhao;Y. Dan;Long Jiang;Yaoqiang Chen
中科院分区：
文献类型：
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作者：
Yanli Liang;Xinmei Ding;Jianli Wang;Ming Zhao;Y. Dan;Long Jiang;Yaoqiang Chen
分别在掺FeOx和掺CeO2的铂基催化剂上消除了柴油排放(CO/C3H6/NO)，比较了反应机理和性能特点。掺杂FeOx的催化剂具有较高的铂分散度、较高的铂价态抑制CO吸附和较高的氧迁移率。较高的分散度和氧的迁移率对催化剂的低温催化氧化性能都有积极的作用，与掺杂CeO2的催化剂相比，CO起燃温度降低了26 °C，C3H6起燃温度降低了12 °C。在FeOx掺杂的催化剂上，较少的表面活性氧物种形成副产物Fe(NO)，使NO的最大转化率降低10%。此外，经还原处理的FeOx掺杂催化剂水热老化表现出较低的起燃温度和较高的NOmax转化率。反应表征的差异启示了氧化催化剂的组成将侧重于后处理系统的实际配置的具体性能，以更好地防止柴油排放。
Diesel emissions (CO/C3H6/ NO) were eliminated on FeOx-doped and CeO2-doped Pt-based catalysts respectively to compare reaction mechanism and performance features. FeOx-doped catalyst has a higher platinum dispersion, a higher platinum valance state retarding CO adsorption and a higher oxygen mobility. Both of the higher dispersion and the oxygen mobility have a positive role in low-temperature catalytic oxidation performance, lower by 26 °C for CO light-off temperature and 12 °C for C3H6light-off temperature respectively than CeO2-doped catalyst. On FeOx-doped catalyst, the lesser surficial active oxygen species form the byproduct Fe(NO), resulting in an reduction of 10% NO maximum conversion. Besides, hydrothermal aged FeOx-doped catalyst with reduction treatment show a relatively lower light-off temperature and a higher NO max conversion. The difference in reaction characterization enlighten that the composition of oxidation catalyst would focus on the specific performance for the practical configuration in aftertreatment system for the better diesel emissions prevention.