Fe2O3 Particles Coated with Silica Using TEOS
Fe2O3 Particles Coated with Silica Using TEOS
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使用 TEOS 涂覆二氧化硅的 Fe2O3 颗粒
DOI：
10.1246/bcsj.76.217
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
R. Tanaka
中科院分区：
文献类型：
--
作者：
S. Sato;Ryōji Takahashi;T. Sodesawa;R. Tanaka
通过使用正硅酸乙酯（TEOS）在氢氧化铁（III）沉淀物上沉积二氧化硅来制备SiO2包覆的Fe 2 O3的细颗粒。二氧化硅沉积在20 °C的温和条件下进行;几乎不发生结晶，并且二氧化硅负载量由所加入的TEOS的量控制，而沉淀物在水热条件下结晶为FeO（OH）和α-Fe 2 O3的混合物。SiO2包覆的Fe 2 O3的比表面积随着二氧化硅负载量的增加而增加，甚至在500 °C煅烧后也超过280 m2 g-1。沉积在氢氧化铁（III）沉淀物上的硅酸盐物种防止初级颗粒在煅烧过程中团聚，导致SiO2-Fe 2 O3的高比表面积和硬还原性。
Fine particles of SiO2-coated Fe2O3 were prepared by depositing silica on an iron(III) hydroxide precipitate using tetraethoxysilane (TEOS). The silica deposition proceeded under mild conditions at 20 °C; crystallization hardly occurred and silica loading was controlled by the amount of TEOS charged, whereas the precipitate crystallized to a mixture of FeO(OH) and α-Fe2O3 under hydrothermal conditions. The specific surface area of the SiO2-coated Fe2O3 increased with silica loading, and exceeded 280 m2 g−1 even after calcination at 500 °C. The silicate species deposited on the precipitate of iron(III) hydroxide prevented the primary particles from agglomerating during calcination, resulting in the high surface area and hard reducibility of the SiO2-Fe2O3.