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首页> 外文期刊>Aerosol and Air Quality Research >Study on Catalytic Soot Oxidation over Spinel Type ACo2O4 (A = Co, Ni, Cu, Zn) Catalysts
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Study on Catalytic Soot Oxidation over Spinel Type ACo2O4 (A = Co, Ni, Cu, Zn) Catalysts

机译：尖晶石型ACo2O4（A = Co，Ni，Cu，Zn）催化剂上催化烟So氧化的研究

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摘要

In this study, a series of spinel type ACo2O4 (A = Co, Ni, Cu, Zn) catalysts were synthesized via a citric acid complex method for catalytic soot oxidation. The effects of A sites on the removal of soot particles and CO2 selectivity was investigated. The best performances for soot oxidation was achieved over ZnCo2O4 with the T50 of 569°C. The textural and redox properties of the ACo2O4 catalysts were tested using BET, XRD, H2-TPR, O2-TPD, XPS. The substitution of A site caused the change of Co3+/(Co2+ + Co3+) ratios as well as the oxygen mobility in the spinel structure. Both Co2+ and Co3+ species were observed on the surface of ACo2O4 catalyst, and Co3+ species were more easily to be reduced to lower states, thus improved the catalytic performance. Compared to other catalysts, the interactions between Zn and Co species led to larger surface area, higher relative concentration of surface active Co3+ and more chemisorbed oxygen species. Additionally, the activity of the catalysts on soot oxidation were inhibited in the presence of sulfur dioxide and water vapor, while nitric oxide facilitated the catalytic activity.
机译：在这项研究中，通过柠檬酸络合物方法合成了一系列尖晶石型ACo2O4（A = Co，Ni，Cu，Zn）催化剂，用于烟灰的催化氧化。研究了A位对烟灰颗粒去除和CO 2选择性的影响。在ZnCo2O4上，T50为569°C时，烟灰氧化性能最佳。使用BET，XRD，H2-TPR，O2-TPD，XPS对ACo2O4催化剂的质构和氧化还原性能进行了测试。 A位点的取代引起Co3 + /（Co2 + + Co3 +）比的变化以及尖晶石结构中的氧迁移率。在ACo2O4催化剂表面均观察到Co2 +和Co3 +种类，并且Co3 +种类更容易还原为较低态，从而提高了催化性能。与其他催化剂相比，Zn和Co物种之间的相互作用导致更大的表面积，更高的表面活性Co3 +相对浓度和更多的化学吸附氧物种。另外，在二氧化硫和水蒸气的存在下，催化剂对烟灰氧化的活性被抑制，而一氧化氮促进了催化活性。

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