Cesium as a dual function promoter in Co/Ce-Sn catalyst for soot oxidation
Cesium as a dual function promoter in Co/Ce-Sn catalyst for soot oxidation
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铯作为 Co/Ce-Sn 烟灰氧化催化剂的双功能促进剂
DOI：
10.1016/j.apcatb.2020.119850
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发表时间：
2021-05
期刊：
影响因子：
--
通讯作者：
Hong He
中科院分区：
文献类型：
--
作者：
Meng Wang;Yan Zhang;Yunbo Yu;Wenpo Shan;Hong He
通过在3%Co/Ce0.5Sn0.5O2中掺杂Cs，制备了具有优异碳烟氧化性能的10%Cs/3%Co/Ce0.5Sn0.5O2催化剂。值得注意的是，在H2O/O2/N2气氛和松散接触下，掺杂Cs使催化剂的T50降低了163 °C。10%Cs/3%Co/Ce_（0.5）Sn_（0.5）O_2催化剂具有良好的耐水性和耐二氧化硫性。表征表明，Cs的掺杂对碳烟催化氧化具有双重作用。一方面，Cs的引入导致了更多的氧缺陷的形成，这有利于表面化学吸附氧的活化。另一方面，它也通过增加表面活性氧物种的流动性，有利于碳烟与催化剂之间的接触，从而有利于催化剂的性能。因此，碱金属铯是一种优良的碳烟催化氧化助剂，所开发的10%Cs/3%Co/Ce0.5Sn0.5O2催化剂在柴油机碳烟催化氧化中具有很好的应用前景。
In this study, a 10 %Cs/3 %Co/Ce0.5Sn0.5O2catalyst with outstanding soot oxidation performance was developed, by doping Cs to 3 %Co/Ce0.5Sn0.5O2. Remarkably, doping Cs lowered the T50of the catalyst by 163 °C under a H2O/O2/N2atmosphere and loose contact. It was also noteworthy that the 10 %Cs/3 %Co/Ce0.5Sn0.5O2catalyst exhibited excellent water and sulfur dioxide resistances. Characterizations indicated that the doping of Cs had dual functional effects on soot catalytic oxidation. On one hand, the introduction of Cs induced the formation of more oxygen defects, which was beneficial to the activation of surface chemisorbed oxygen. On the other hand, it also benefited the catalytic performance by increasing the mobility of the surface-active oxygen species, which favored the contact between soot and catalyst. Therefore, the alkali metal cesium was found to be an excellent promoter for soot catalytic oxidation, and the developed 10 %Cs/3 %Co/Ce0.5Sn0.5O2catalyst is very promising for practical applications in diesel soot oxidation.
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