Preparation and properties of novel microporous metal oxides

在这项研究中，我们可以在新型微孔金属氧化物的制备和性质方面取得许多结果。主要研究结果如下：1)制备具有均匀微孔的赤铁矿颗粒以Delta-FeOH为原料合成了孔径为1 nm的狭缝状赤铁矿颗粒，该颗粒具有较高的吸附选择性，适合作为催化剂及其载体。2)铁磁性多孔金属氧化物的合成不同于其他铁氧基氢氧化物，Delta-FeOOH中的Fe离子易被二价金属离子取代。通过对掺杂不同二价金属离子的β-FeOOH进行高温处理，制得了含二价金属离子的氧化铁颗粒。形成的颗粒具有均匀的微孔，具有亚铁磁性。该材料可用作拖曳输送系统的吸附剂，也可作为磁铁移动固定的吸附剂和催化剂。3)制备具有较高氧化稳定性的多孔型磁铁矿。形成的颗粒中Fe(II)含量比通常的磁铁矿大得多。所得磁铁矿的电导率比商业磁铁矿高两个数量级。4)磷酸铝孔结构的控制在Fe(III)、Co(II)、Zn(II)和Mn(II)离子存在的情况下制备了球形的磷酸铝颗粒。掺杂的金属离子不包含在颗粒中，除了Fe外，还产生了孔隙率。该方法可用于控制磷酸铝颗粒的孔结构。

In this study, we could obtain many results on the preparation and properties of novel microporous metal oxides. The main results of the obtained ones are as follows.1) Preparation of hematite particles with uniform microporesThe hematite particles with slit-shaped pores with uniform width of 1nm were synthesized from delta-FeOOH.These particles exhibit a high adsorption selectivity and is suitable for catalysts and their carriers.2) Synthesis of ferrimagnetic porous metal oxidesThe Fe ions of delta-FeOOH are rather easily replaced with divalent metal ions, deferent from the other ferric oxyhydroxides. The ferric oxide particles containing divalent metal ions were produced by treating delta-FeOOH doped with various divalent metal ions at elevated temperatures. The formed particles had uniform micropores and were ferrimagnetic. This material can be used as adsorbents for drag delivery system and adsorbent and catalysts capable of moving and fixing with a magnetic filed.3) Preparation of porous magnetite with a high stability to oxidationThe high stable magnetite particles were obtained by doping a slight amount of Co and Ni. The Fe (II) contents of the formed particled were much larger than as usual magnetite. The electrical conductivity of the obtained magnetites was higher in two order than a commercial one. These magetites are able to be employed for chemical sensors.4) Control of the pore structure of aluminum phosphatesThe spherical aluminum phosphate particles were prepared in the presence of Fe (III) , Co (II) , Zn (II) and Mn (II) ions. The doped metal ions were not contained in the particles and developed the porosity besides Fe. This method can be applied for controlling of the pore structure of aluminum phosphate particles.