Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo2O4 Spinel Catalysts
Promotional Effects of Sm/Ce/La Doping on Soot Oxidation over MnCo2O4 Spinel Catalysts
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Sm/Ce/La 掺杂对 MnCo2O4 尖晶石催化剂烟灰氧化的促进作用
DOI：
10.1021/acs.jpcc.1c07736
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发表时间：
2021-11
期刊：
影响因子：
--
通讯作者：
Hong He
中科院分区：
文献类型：
--
作者：
Ke Xu;Yan Zhang;Wenpo Shan;Hong He
Sm/La/Ce-doped spinel catalysts were prepared by a sol–gel method, and their catalytic performance in soot oxidation was investigated. The catalytic activity of the samples was ranked as follows: Sm0.1Mn0.9Co2O4> Ce0.1Mn0.9Co2O4> La0.1Mn0.9Co2O4> MnCo2O4. Numerous analytical techniques including X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), O2-temperature-programmed desorption (TPD), H2-temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) were performed to investigate the structural and physicochemical properties of the catalysts. The XRD patterns confirmed that the doped ions had been incorporated into the lattice of the spinel oxides. The crystallite size decreased after doping, resulting in an increase inSBET, as proved by the results of SEM and BET. The characterization results (H2-TPR, O2-TPD, and XPS) revealed that the amounts of Co3+and surface-active oxygen species of catalysts were increased after doping. The Co3+and Oαratios of the catalysts were linearly correlated with the catalytic activity, indicating that Co3+and Oαplayed important roles in soot combustion. Co3+was deemed to promote soot oxidation by generating more NO2, which could react with soot to form surface oxygen complexes (SOCs), and then the Oαcould oxidize the SOCs to generate CO2. This study provides rational insights into the influence of heteroatom doping on soot oxidation over spinel oxide catalysts.
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