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 precursor solutions consisting of Si(OEt)₄, Ce(NO₃)₃·6H₂O, 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)₃·6H₂O, the specific surface area was over 300 m²/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 °C for 3 h or at 700 °C for 72 h in air.

我们提出了一种新的方法来制备具有增强的耐热性的CeO ₂纳米粒子（NPs）。的SiO ₂与混合的CeO ₂在纳米级，得到的SiO ₂ -CeO ₂通过由Si（OET）的前体溶液的溶剂热反应NP复合材料₄，CE（NO ₃）₃ ·6H ₂ O，和Ñ，N，N ′，N′-四甲基乙二胺在甲醇中。通过调节Si（OEt）₄可自由控制SiO ₂ ‒CeO ₂ NP复合材料中的SiO ₂含量 前体溶液中的摩尔分数在0-0.5范围内。随着SiO ₂ ‒CeO ₂ NP复合材料中SiO ₂含量的增加，CeO ₂ NPs的一次粒径减小，并且SiO ₂ ‒CeO ₂ NP复合材料的比表面积显着增加。对于由1：1的Si（OEt）₄和Ce（NO ₃）₃ ·6H ₂ O组成的前体溶液获得的SiO ₂ ‒CeO ₂ NP复合材料，比表面积超过300 m ² / g。通过保留小尺寸的CeO，获得了出色的耐热性即使在空气中在850°C下煅烧3 h或在700°C下煅烧72 h后，仍具有_2个微晶以及SiO ₂ ‒CeO ₂ NP组件的大比表面积。