Abstract The effects of the carrier and the content of the active species were studied in the carbon monoxide oxidation process. MnOx catalysts supported on ZrO2, CeO2, MgO, SiO2, and Al2O3 were prepared and characterized by XRD, BET-BJH, FE-SEM, EDX, TPR, and CO2-TPD analyses. The relation between the textural properties of the catalysts and the catalytic performance was investigated. The results showed that Mn/CeO2 catalyst despite of its lowest surface area (55.5 m2/g) possessed the highest activity among other catalysts. High ability to supply oxygen through the support during the reaction is the most important reason for the proper performance of this catalyst. The investigation of the Mn content indicated that the 20 wt% Mn/CeO2 showed high dispersion, appropriate reducibility and the highest concentration of active sites compared to other catalysts with various Mn contents. The temperature corresponding to 50% of the CO conversion (T50) was about 142 °C, which was 20 °C lower than the other samples. In addition, the influence of different parameters including pretreatment condition, feed ratio, and GHSV was examined on the catalytic performance. The results showed that the catalytic stability declined with the incorporation of water vapor and CO2 in the feed mixture.

中文翻译：

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负载型Mn催化剂及不同载体在一氧化碳催化氧化中的作用

摘要 研究了一氧化碳氧化过程中载体和活性物种含量的影响。制备了负载在 ZrO2、CeO2、MgO、SiO2 和 Al2O3 上的 MnOx 催化剂，并通过 XRD、BET-BJH、FE-SEM、EDX、TPR 和 CO2-TPD 分析对其进行了表征。研究了催化剂的结构性质与催化性能之间的关系。结果表明，Mn/CeO2 催化剂尽管具有最低的表面积（55.5 m2/g），但在其他催化剂中却具有最高的活性。在反应过程中通过载体提供氧气的能力强是该催化剂性能良好的最重要原因。Mn 含量的研究表明 20 wt% Mn/CeO2 表现出高分散性，与具有不同锰含量的其他催化剂相比，具有适当的还原性和最高浓度的活性位点。对应于 50% CO 转化率 (T50) 的温度约为 142 °C，比其他样品低 20 °C。此外，还考察了包括预处理条件、进料比和 GHSV 在内的不同参数对催化性能的影响。结果表明，随着进料混合物中加入水蒸气和CO2，催化稳定性下降。