介孔材料
奥斯特瓦尔德成熟
热分解
甲酰胺
材料科学
化学工程
溶剂
透射电子显微镜
热重分析
化学
催化作用
纳米技术
有机化学
工程类
作者
Jingjing Wei,Zhijie Yang,Yanzhao Yang
出处
期刊:CrystEngComm
[The Royal Society of Chemistry]
日期:2011-01-01
卷期号:13 (7): 2418-2418
被引量:54
摘要
In this paper, three dimensional mesoporous CeO2 hierarchical structures were synthesized through the thermal decomposition of cerium formate precursors, which were prepared by a solvothermal method. X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR), and Thermal gravimetric (TG) was applied to characterize the precursors. Urchin-like Ce(HCOO)3 precursors were prepared using dimethyl sulfoxide (DMSO) and ammonia solution (1 M) as solvent and base source, respectively, while coral-like Ce(HCOO)3 precursors were prepared using dimethyl formamide (DMF) and NH4HCO3 as solvent and base source, respectively. The formation mechanism of the hierarchical structured precursors was proposed involving a process of anisotropic growth–H2O induced self-assembly–oriented aggregation and disassembly–Ostwald ripening. CeO2 hierarchical structures were obtained by annealing the corresponding Ce(HCOO)3 precursors at 400 °C for 60 min. N2 adsorption–desorption isotherms indicate that both CeO2 hierarchical structures derived from their Ce(HCOO)3 precursors display large surface areas and high pore volumes. In addition, the as-prepared CeO2 catalysts with hierarchical structures are highly active for conversion of CO to CO2.
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