Ordered Mesoporous Alumina-Supported Metal Oxides
Ordered Mesoporous Alumina-Supported Metal Oxides
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DOI：
10.1021/ja806429q
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发表时间：
2008-11-12
影响因子：
15
通讯作者：
Jaroniec, Mietek
中科院分区：
文献类型：
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作者：
Morris, Stacy M.;Fulvio, Pasquale F.;Jaroniec, Mietek
详细描述了在三嵌段共聚物(作为结构导向剂)存在下，金属前驱体与异丙醇铝自组装一锅法合成氧化铝负载金属氧化物的方法。得到的介孔混合金属氧化物具有p6 mm的六方对称性、良好的介孔结构、较高的比表面积、较大的孔宽和晶态孔壁。与纯氧化铝相比，镍铝氧化物样品具有更大的介孔和更好的热稳定性。此外，对于镍摩尔百分比高达20%的上述样品也观察到了长程有序化。通过制备氧化镁、氧化钙、二氧化钛和三氧化二铬等氧化铝负载金属氧化物，证明了合成介孔镍铝氧化物的配方具有通用性。这种方法代表着朝着简单和可重复地合成有序介孔氧化铝载体材料的方向迈出了重要的一步，这些材料适用于需要大而易接近的孔和高负载催化活性金属氧化物的各种应用。
The one-pot synthesis of alumina-supported metal oxides via self-assembly of a metal precursor and aluminum isopropoxide in the presence of triblock copolymer (as a structure directing agent) is described in detail for nickel oxide. The resulting mesoporous mixed metal oxides possess p6mm hexagonal symmetry, well-developed mesoporosity, relatively high BET surface area, large pore widths, and crystalline pore walls. In comparison to pure alumina, nickel aluminum oxide samples exhibited larger mesopores and improved thermal stability. Also, long-range ordering of the aforementioned samples was observed for nickel molar percentages as high as 20%. The generality of the recipe used for the synthesis of mesoporous nickel aluminum oxide was demonstrated by preparation of other alumina-supported metal oxides such as MgO, CaO, TiO2, and Cr2O3. This method represents an important step toward the facile and reproducible synthesis of ordered mesoporous alumina-supported materials for various applications where large and accessible pores with high loading of catalytically active metal oxides are needed.