One-pot synthesis of SiO2-CeO2 nanoparticle composites with enhanced heat tolerance
One-pot synthesis of SiO2-CeO2 nanoparticle composites with enhanced heat tolerance
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DOI：
10.1016/j.micromeso.2018.06.043
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发表时间：
2019-01-01
影响因子：
5.2
通讯作者：
Kobiro, Kazuya
中科院分区：
文献类型：
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作者：
Hien Thi Thu Nguyen;Ohtani, Masataka;Kobiro, Kazuya
我们提出了一种新的方法，用于制造CeO 2纳米粒子（NPs）具有增强的耐热性。以Si（OEt）（4）、Ce（NO3）（3）中心点6 H（2）O和N，N，N '，N'-四甲基乙二胺为前驱体，在甲醇中进行溶剂热反应，制备了SiO2-CeO 2纳米粒子复合材料。SiO_2-CeO_2 NP复合材料中SiO_2含量可通过调节前驱体溶液中Si（OEt）_4的摩尔分数在0 ~ 0.5范围内自由控制。随着SiO2-CeO 2 NP复合材料中SiO2含量的增加，CeO 2 NP的一次粒径减小，比表面积显著增加。由1：1的Si（OEt）（4）和Ce（NO3）（3）中心点6 H（2）O组成的前驱体溶液制备的SiO2-CeO 2 NP复合材料的比表面积大于300 m2/g。通过保留小尺寸的CeO 2微晶以及SiO2-CeO 2 NP组件的大比表面积，即使在850 ℃下煅烧3小时或在700 ℃下在空气中煅烧72小时后，也实现了优异的耐热性。
We propose a novel method for the fabrication of CeO2 nanoparticles (NPs) with enhanced heat tolerance. SiO2 was mixed with CeO2 at the nano-level to yield SiO2-CeO2 NP composites by a solvothermal reaction of pre-cursor solutions consisting of Si(OEt)(4), Ce(NO3)(3)center dot 6H(2)O, and N,N,N',N'-tetramethylethylenediamine in methanol. SiO2 content in the SiO2-CeO2 NP composites was freely controllable by adjusting the Si(OEt)(4) mol fraction in range of 0-0.5 in the precursor solutions. With an increase of SiO2 content in the SiO2-CeO2 NP composites, the primary particle sizes of the CeO2 NPs decreased, and the specific surface areas of the SiO2-CeO2 NP composites increased remarkably. For SiO2-CeO2 NP composites obtained from a precursor solution consisting of 1:1 Si (OEt)(4) and Ce(NO3)(3)center dot 6H(2)O, the specific surface area was over 300 m(2)/g. Excellent heat tolerance was achieved through the retention of small size of CeO2 crystallites, as well as the large specific surface areas of the SiO2-CeO2 NP assemblies, even after calcination at 850 degrees C for 3 h or at 700 degrees C for 72 h in air.