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Energy-Guided Shape Control Towards Highly Active CeO2

机译:能源引导的形状控制高度活跃的CEO2

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摘要

The shape of nanosized CeO2, obtained via polyvinylpyrrolidone (PVP) micelles, was controlled by microwave (MW)-aided synthesis combined with different combinations of energy input/transfer, including ultrasound (US), ultraviolet (UV) and pressure (P). Whereas ceria nanoflakes resulted from standard solvothermal synthesis, CeO(2)nanoparticles were obtained from MW, MW + US and MW + UV. New CeO2"nanospindles" (with aspect ratio of 2) resulted from MW + US + UV, and nanorods (with aspect ratio of 11) emerged from MW + P. All ceria morphologies, even nanospindles and nanorods, were mesoporous agglomerates of small CeO(2)nanocrystals (6-8 nm size), but they still exhibited different specific surface area (SSA) and Ce3+/Ce(4+)ratio. Underlying reasons of how the different synthesis routes affect the ceria morphology are discussed. Among the six types, CeO(2)nanorods (MW + P) exhibited the highest SSA (196 m(2 ) g(-1)) and the most surface defects (Ce3+: 26.4%), resulting in excellent catalytic performance in imine synthesis and CO oxidation.
机译:通过聚乙烯吡咯烷酮(PVP)胶束获得的纳米CeO2的形状通过微波(MW)辅助合成以及不同的能量输入/转移组合(包括超声波(US)、紫外线(UV)和压力(P))进行控制。虽然氧化铈纳米片是通过标准溶剂热合成得到的,但CeO(2)纳米颗粒是通过微波、微波+超声和微波+紫外线获得的。MW+US+UV产生了新的CeO2“纳米轴”(长径比为2),MW+P产生了纳米棒(长径比为11)。所有的氧化铈形貌,甚至纳米轴和纳米棒,都是小尺寸CeO(2)纳米晶体(6-8nm)的介孔聚集体,但它们仍然表现出不同的比表面积(SSA)和Ce3+/Ce Ce 4+比。讨论了不同合成路线影响氧化铈形貌的根本原因。在这六种类型中,CeO(2)纳米棒(MW+P)表现出最高的SSA(196 m(2)g(-1))和最多的表面缺陷(Ce3+:26.4%),因此在亚胺合成和CO氧化中具有优异的催化性能。

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