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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Highly efficient UV-Vis-infrared catalytic purification of benzene on CeMnxOy/TiO2 nanocomposite, caused by its high thermocatalytic activity and strong absorption in the full solar spectrum region
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Highly efficient UV-Vis-infrared catalytic purification of benzene on CeMnxOy/TiO2 nanocomposite, caused by its high thermocatalytic activity and strong absorption in the full solar spectrum region

机译：CeMnxOy / TiO2纳米复合材料上苯的高效UV-Vis红外催化纯化，这是由于其高的热催化活性和在整个太阳光谱范围内的强吸收性

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摘要

The nanocomposite of amorphous cerium manganese oxide supported on nano TiO2 (CeMnxOy/TiO2) was prepared by the facile hydrothermal redox reaction of Ce(NO3)(3) and KMnO4 in the presence of nano TiO2. The CeMnxOy/TiO2 nanocomposite was characterized by XRD, TEM, SEM, EDX, XPS, BET, CO-TPR, and diffusive reflectance UV-Vis-IR absorption. It exhibits efficient thermocatalytic activity for the oxidation of the carcinogenic and recalcitrant benzene, which is comparable to that of the expensive noble metal catalyst (0.5% Pt/Al2O3), and is much higher than the CeO2/TiO2 and MnOx/TiO2 nanocomposites with the same metal/Ti molar ratio. Its specific CO2 production rate (rCO(2)) at 220 degrees C (88.6 mmol g(-1) min(-1)) is 6.3 and 7.5 times higher than the nanocomposites of CeO2/TiO2 and MnOx/TiO2, respectively. The highly efficient thermocatalytic activity of the CeMnxOy/TiO2 nanocomposite is attributed to its higher oxygen activity, compared to the nanocomposites of CeO2/TiO2 and MnOx/TiO2. Remarkably, the CeMnxOy/TiO2 nanocomposite can be driven by simulated solar light for benzene oxidation. It exhibits highly efficient catalytic activity with the irradiation of the full solar spectrum, visible-infrared, and infrared light. Its initial CO2 production rate is 117.0, 94.8 and 37.9 mmol g(-1) catalyst min(-1), under the irradiation of the full solar spectrum, visible-infrared light with wavelength above 420 nm, and infrared light with wavelength above 830 nm, respectively. This is attributed to the fact that the CeMnxOy/TiO2 nanocomposite efficiently transforms the absorbed solar energy into thermal energy, due to its strong absorption in the full solar spectrum region, resulting in a significant increase in its temperature above its light-off temperature, for the thermocatalytic oxidation of benzene.
机译：在纳米TiO2存在下，通过Ce（NO3）（3）和KMnO4的水热氧化还原反应制备了负载在纳米TiO2上的非晶态铈锰氧化物纳米复合材料（CeMnxOy / TiO2）。 CeMnxOy / TiO2纳米复合材料的特征在于XRD，TEM，SEM，EDX，XPS，BET，CO-TPR和漫反射UV-Vis-IR吸收。它对致癌和难分解的苯的氧化具有有效的热催化活性，可与昂贵的贵金属催化剂（0.5％Pt / Al2O3）相媲美，并且远高于具有这种结构的CeO2 / TiO2和MnOx / TiO2纳米复合材料。相同的金属/钛摩尔比。它在220摄氏度（88.6 mmol g（-1）min（-1））下的比CO2产生率（rCO（2））分别比CeO2 / TiO2和MnOx / TiO2纳米复合材料高6.3和7.5倍。与CeO2 / TiO2和MnOx / TiO2纳米复合材料相比，CeMnxOy / TiO2纳米复合材料的高效热催化活性归因于其较高的氧活性。值得注意的是，CeMnxOy / TiO2纳米复合材料可以通过模拟太阳光驱动苯氧化。它在全太阳光谱，可见红外和红外光的照射下表现出高效的催化活性。在全太阳光谱，波长大于420 nm的可见红外光和波长大于830的红外光的照射下，其初始CO2产生速率为117.0、94.8和37.9 mmol g（-1）催化剂min（-1）。纳米。这归因于以下事实：由于CeMnxOy / TiO2纳米复合材料在整个太阳光谱区域中的强吸收性，因此它可以将吸收的太阳能有效地转换成热能，从而导致其起燃温度以上的温度显着升高。苯的热催化氧化。

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