Effect of MnOx phase on Pt-based catalyst for enhancing CO/C3H6/NO oxidation performance
Effect of MnOx phase on Pt-based catalyst for enhancing CO/C3H6/NO oxidation performance
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DOI：
10.1016/j.ijhydene.2022.07.041
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发表时间：
2022-08
影响因子：
7.2
通讯作者：
Yanli Liang;Darong He;Xinmei Ding;Jianli Wang;Ming Zhao;Yaoqiang Chen
中科院分区：
文献类型：
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作者：
Yanli Liang;Darong He;Xinmei Ding;Jianli Wang;Ming Zhao;Yaoqiang Chen
为了提高柴油机的燃油经济性，提高柴油机的低温性能是消除柴油机排放的关键。研究了不同MnO 2/Mn 2 O3物比对Pt基整体式柴油机氧化催化剂低温性能的影响。MnOx相的比例接近相等时，可形成Pt、MnO 2、Mn 2 O3三相界面结构，使Pt粒径变小，界面速率比其它单锰氧化物高1.6-11.1倍。Pt/MnO_x界面具有较高的氧迁移率和较多的活性氧物种，对反应物的活化起着积极的作用，大大提高了TOF值（1.4-20.8倍）。结果表明，多相金属/氧化物界面的改性是潜在的分散铂，大大提高催化剂的效率。
To improve the fuel economy, it is crucial to promote the low-temperature performance in eliminating diesel emissions. The work investigates the impact of different MnO2/Mn2O3phase ratio on the low-temperature performance of Pt-based monolithic diesel oxidation catalyst. Near equal ratio of MnOxphase could form the three-phase (platinum, MnO2, Mn2O3) interfacial structure, leading to the smaller platinum particle size and exhibiting the higher interface rate (1.6–11.1 times) than other mono-manganese oxide with platinum. Besides, the higher oxygen mobility and more active oxygen species could be contributed to the positive effect of Pt/MnOxinterface, which are prevalent to activate the reactant and greatly enhance the TOF value (1.4–20.8 times). The results imply that the modification of multi-phase metal/oxide interface is potential in dispersing platinum for greatly enhancing the catalytic efficiency.