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Morphology-dependent properties of CeO2 nano-catalysts on CH2Cl2 oxidation

机译:CeO2纳米催化剂对CH2Cl2氧化的形态学依赖性

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Four types of CeO2 nanoparticles with different morphologies (nanorods, nanocubes, nanopolyhedra, and bulk CeO2 nanoparticles) were synthesized and used in dichloromethane (DCM) oxidation. Their detailed physicochemical properties were investigated by X-ray diffraction, N-2 physisorption, H-2 temperature-programmed reduction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. Results indicated that DCM oxidation over CeO2 nanoparticles has significant morphology-dependent effects. CeO2 nanorods showed the best activity among all the investigated samples (T-90 is only 323 degrees C). The main products were CO2 and HCl, although trace amounts of CHCl3, CCl4, CO, and Cl-2 could be detected. The high performance of CeO2 nanorods in DCM oxidation may be related to the abundant surface defects, increased amount of adsorbed active oxygen species, and good reducibility of the catalyst.
机译:合成了四种具有不同形态的CeO2纳米颗粒(纳米颗粒,纳米立方体,纳米多面体和块状CeO2纳米颗粒),并将其用于二氯甲烷(DCM)氧化。通过X射线衍射,N-2物理吸附,H-2程序升温还原,高分辨率透射电子显微镜和X射线光电子能谱研究了它们的详细理化性质。结果表明,CeO2纳米颗粒上的DCM氧化具有明显的形态依赖性。 CeO2纳米棒在所有研究样品中显示出最佳的活性(T-90仅323摄氏度)。主要产物为CO2和HCl,尽管可以检测到痕量的CHCl3,CCl4,CO和Cl-2。 CeO2纳米棒在DCM氧化中的高性能可能与丰富的表面缺陷,增加的活性氧吸附量以及良好的催化剂还原性有关。

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