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首页> 外文期刊>RSC Advances >Synthesis of three-dimensional ordered mesoporous MnOx/CeO2 bimetal oxides for the catalytic combustion of chlorobenzene
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Synthesis of three-dimensional ordered mesoporous MnOx/CeO2 bimetal oxides for the catalytic combustion of chlorobenzene

机译：三维有序介孔MnO x / CeO 2 双金属氧化物的合成用于催化燃烧氯苯

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A series of CeO2 supported ordered mesoporous MnOx/CeO2 bimetal oxides with 3-D bi-continuous pore structure were prepared by an incipient-wetness impregnation method, and used in the catalytic combustion of chlorobenzene (CB) as a model of dioxins. The as-synthesized catalysts were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) N2 adsorption, respectively. The effect of pore structure and Mn loading content on catalytic properties and textural structure had been explored. On Mn/Ce(0.43) (molar ratio Mn/Ce equal to 0.43), the T90 (temperature at which 90% conversion is attained) is 279 °C. Compared with other MnOx/CeO2 samples with different Mn loading contents, the high activity of Mn/Ce(0.43) is ascribed to well dispersed MnOx and a large amount of active chemisorbed oxygen species. This Mn/Ce(0.43) catalyst can maintain 90% CB conversion at 350 °C for at least 1000 min. And kinetics of on Mn/Ce(0.43) at 200 and 300 °C showed a dependence of rate on CB concentration is of first order, well within the inlet CB concentration from 500 to 2000 ppm. In addition, the T90 of Mn/Ce(0.43) is significantly lower than that of the general Mn/Ce-NPs, and the enhanced activity of Mn/Ce(0.43) is due to its bi-continuous 3-D ordered pore structure.
机译：一系列CeO 2 支持的有序介孔MnO x / CeO 采用初湿浸渍法制备了具有3-D双连续孔结构的 2 双金属氧化物，并作为二恶英的模型用于氯苯（CB）的催化燃烧。通过透射电子显微镜（TEM），X射线衍射（XRD），氢气程序升温还原（H 2 -TPR），X对合成后的催化剂进行表征。射线光电子能谱（XPS）和Brunauer–Emmett–Teller（BET）分别吸附N 2 。探讨了孔结构和Mn含量对催化性能和织构的影响。在Mn / Ce（0.43）（摩尔比Mn / Ce等于0.43）上， T 90 （90％的转化温度为达到279°C。与其他锰含量不同的MnO x / CeO 2 样品相比， Mn / Ce（0.43）的高活性归因于分散良好的MnO x 和大量的活性化学吸附氧。这种Mn / Ce（0.43）催化剂可以在350°C下保持90％的CB转化率至少1000分钟。 Mn / Ce（0.43）在200和300°C时的动力学表明速率对CB浓度的依赖性是一阶的，很好地在入口CB浓度500-2000 ppm范围内。另外，Mn / Ce（0.43）的 T 90 显着低于一般的Mn / Ce-NPs，且Mn / Ce（0.43）的增强活性归因于其双连续的3-D有序孔结构。

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