TiO 2 / CeO 2纳米复合材料上苯气相气相氧化对TiO 2光催化和对CeO 2热催化的协同作用,ACS Catalysis

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TiO ₂ / CeO ₂纳米复合材料上苯气相气相氧化对TiO ₂光催化和对CeO _2热催化的协同作用
ACS Catalysis ( IF 11.3 ) Pub Date : 2015-04-28 00:00:00 , DOI: 10.1021/acscatal.5b00292
Min Zeng ₁ , Yuanzhi Li ₁ , Mingyang Mao ₁ , Jilin Bai ₁ , Lu Ren ₁ , Xiujian Zhao ₁

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制备了负载在中孔CeO ₂上的锐钛矿型TiO ₂纳米颗粒的TiO ₂ / CeO ₂纳米复合材料，并通过SEM，TEM，BET，XRD，拉曼，XPS和漫反射紫外可见吸收光谱进行了表征。与纯CeO ₂和TiO ₂相比，在Xe灯照射下，TiO ₂ / CeO ₂纳米复合材料的形成大大增强了它们对苯的气相氧化催化活性，苯是一种有害的挥发性有机化合物（VOC）。。发现了TiO ₂ / CeO _2的太阳光驱动的CeO ₂热催化作用纳米复合材料。TiO ₂ / CeO ₂纳米复合材料对TiO ₂的光催化与对CeO ₂的热催化之间存在协同作用，从而大大提高了它们的催化活性。Ti / Ce摩尔比为0.108的TiO ₂ / CeO ₂纳米复合材料在协同光热催化条件下的CO ₂形成速率（r _CO2）比其r _CO_₂高36.4倍。在接近室温的常规光催化条件下。在氙气灯的照射下和在黑暗中进行的CO程序升温还原（CO-TPR）表明，在TiO ₂ / CeO ₂纳米复合材料的界面处发生的协同效应是由于CeO的显着促进通过在TiO ₂上进行光催化将₂还原。

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Synergetic Effect between Photocatalysis on TiO2 and Thermocatalysis on CeO2 for Gas-Phase Oxidation of Benzene on TiO2/CeO2 Nanocomposites

TiO₂/CeO₂ nanocomposites of anatase TiO₂ nanoparticles supported on microsized mesoporous CeO₂ were prepared and characterized by SEM, TEM, BET, XRD, Raman, XPS, and diffuse reflectance UV–vis absorption. The formation of the TiO₂/CeO₂ nanocomposites considerably enhances their catalytic activity for the gas-phase oxidation of benzene, one of the hazardous volatile organic compounds (VOCs), under the irradiation of a Xe lamp compared to pure CeO₂ and TiO₂. A solar-light-driven thermocatalysis on CeO₂ is found for the TiO₂/CeO₂ nanocomposites. There is a synergetic effect between the photocatalysis on TiO₂ and the thermocatalysis on CeO₂ for the TiO₂/CeO₂ nanocomposites, which significantly increases their catalytic activity. The CO₂ formation rate (r_CO2) of the TiO₂/CeO₂ nanocomposite with the Ti/Ce molar ratio of 0.108 under the synergetic photothermocatalytic condition is 36.4 times higher than its r_CO₂ under the conventional photocatalytic condition at near room temperature. CO temperature-programmed reduction (CO-TPR) with the irradiation of the Xe lamp and in the dark reveals that the synergetic effect, which occurs at the interface of the TiO₂/CeO₂ nanocomposite, is due to the considerable promotion of the CeO₂ reduction by the photocatalysis on TiO₂.

更新日期：2015-04-28

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