Synthesis of Porous α-Fe2O3 Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO
Synthesis of Porous α-Fe2O3 Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO
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DOI：
10.1021/cm071165a
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发表时间：
2007-08
影响因子：
8.6
通讯作者：
Z. Zhong;Judith Ho;Jaclyn Teo;A. Shen;A. Gedanken
中科院分区：
文献类型：
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作者：
Z. Zhong;Judith Ho;Jaclyn Teo;A. Shen;A. Gedanken
以氢氧化四乙铵（TEAOH）作为结构导向剂，通过温和的水热合成法制备了羟基氧化亚铁（FeO(OH)）纳米棒。所制备的FeO(OH)在300°C下煅烧转化为多孔的α - Fe₂O₃纳米棒。α - Fe₂O₃纳米棒的孔径分布在1 - 5纳米范围内，这对于容纳非常小的金（Au）颗粒是理想的。随后，利用我们发明的金胶体方法，其中赖氨酸用作封端试剂，并采用超声处理以促进金颗粒的沉积，我们将非常小的金颗粒插入这些孔隙中。所制备的Au/α - Fe₂O₃ - 纳米棒催化剂比Au/α - Fe₂O₃（Fluka）催化剂表现出更高的催化活性。
FeO(OH) nanorods were prepared by a mild hydrothermal synthesis using tetraethylammonium hydroxide (TEAOH) as the structure director. The as-prepared FeO(OH) was converted to porous α-Fe2O3 nanorods via calcination at 300 °C. The α-Fe2O3 nanorods have a pore size distribution in the range of 1−5 nm, which is ideal to house very small gold (Au) particles. Later, by employing our invented Au- colloid-method, in which lysine was used as the capping reagent and sonication was employed to facilitate the deposition of the Au particles, we inserted very small Au particles into these pores. The prepared Au/α-Fe2O3-nanorod catalyst exhibited higher catalytic activity than the Au/α-Fe2O3 (Fluka) catalyst.