Development of New Materials for NOx Removal

用于从车辆的流动气体中去除氮氧化物的新材料已经被研究过。我们研究了在250 - 400 ° C的氮氧化物的反应。Spinel ferManagement is know to be active materials for CO D22 D2 decomposition at 300弧度。这对环境来说是廉价的，而且并不有害。在400 ℃以下的尖晶el ferrite被已知为形成氧-excess尖晶el ferrite which已被明显减少到stoichiometric尖晶el ferrite by reduction with CO或H-D22-D2，或在300 ℃的evacuation treatment。我们找到了磁铁， Ni（II）-替代磁铁， Zn（II）-替代磁铁和Co（II）-替代磁铁，用湿法在65 ° C降低硝基单氧化物在这个温度范围内由批次和流动反应方法两种。反应是由螺旋铁铁氧化物引起的。Ni（II）的反应率-替代的磁铁铁在准备的铁中显示出最高的减少率，并通过增加镍对铁的摩尔率，建议Ni（II）的做法是建议在尖晶石表面上减少NO。对于另一个反应性的尖晶石铁的准备，我们对超精尖晶石铁的综合体进行了调查。我们通过调节氧化率、pH值和其他方法来调节自旋铁的房间温度合成法成功完成。使用此方法，自旋铁的平均直径小于100纳米。然而，超精细螺旋铁合成的反应条件还不清楚，因此需要对本研究进行进一步的调查。在下一个阶段，我们将继续研究利用化学和固体电解质反应进行反应性铁的反应。

New materials for removal NOx from flue gases of vehicles has been studied. We have studied on the reactivity of spinel ferrite with NOx at 250 〜 400 ℃. Spinel ferrite is know to be active materials for COィイD22ィエD2 decomposition at 300 ℃. It is cheap and not harmful to the environment. Oxidation of spinel ferrite below 400 ℃ is known to form oxygen-excess spinel ferrite which is readily reduced to stoichiometric spinel ferrite by reduction with CO or HィイD22ィエD2, or evacuation treatment at 300 ℃. We found that magnetite, Ni(II)-substituted magnetite, Zn(II)-substituted magnetite and Co(II)-substituted magnetite prepared by wet method at 65 ℃ reduced nitrogen monoxide at this temperature range by both the batch and the flow reaction methods. The reaction proceeded accompanied by the oxidation of spinel ferrite. The reaction rate of Ni(II)-substituted magnetite ferrite for NO reduction showed the highest among the prepared ferrite, and was enhanced by increasing the molar ratio of Ni-to-Fe, suggesting that Ni(II) ions promote the reduction of NO on the surface of spinel ferrite. For the preparation of further reactive spinel ferrite, we investigated on the synthesis of super-fine spinel ferrite by wet method. We succeeded in the room temperature synthesis of spinel ferrite by regulating the oxidation rate, pH value and so on. By using this method, spinel ferrite with its average diameter less than 100 nm was obtained. Still, the reaction condition for the synthesis of super-fine spinel ferrite is not knows, further investigation on this study is required. In the next stage, we are going to study on the reactivation of reacted ferrite using chemical and solid electrolyte reactions.