Preparation and properties of novel microporous metal oxides

在本研究中，我们在新型微孔金属氧化物的制备和性能方面取得了许多成果。得到的主要结果如下：1)具有均匀微孔的赤铁矿颗粒的制备以δ - feooh为原料合成具有均匀宽度为1nm的狭缝状孔隙的赤铁矿颗粒。这些颗粒具有较高的吸附选择性，适合作催化剂及其载体。2)铁磁性多孔金属氧化物的合成与其它铁氧氢氧化物不同，δ - feooh中的铁离子很容易被二价金属离子取代。采用掺杂不同二价金属离子的δ - feooh在高温下处理制备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和铁磁性。该材料可作为吸附剂用于拖拽系统和吸附剂和催化剂能够移动和固定磁场。3)制备具有高氧化稳定性的多孔磁铁矿通过掺杂少量的Co和Ni，获得了高稳定性的磁铁矿颗粒。形成的颗粒中Fe （II）的含量比一般的磁铁矿大得多。所得磁铁矿的电导率比市售磁铁矿高两级。这些磁铁矿可用于化学传感器。4)控制磷酸铝的孔隙结构在Fe （III）、Co （II）、Zn （II）和Mn （II）离子存在下制备球形磷酸铝颗粒。掺杂的金属离子不含在颗粒中，除Fe外形成孔隙。该方法可用于控制磷酸铝颗粒的孔隙结构。

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.