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Development of New Materials for NOx Removal

脱硝新材料的开发

基本信息

批准号：
09558079
负责人：
TABATA Masahiro
金额：
$ 4.74万
依托单位：
Toyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

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.

研究了汽车尾气脱硝的新材料。研究了尖晶石型铁氧体在250 ~ 400 ℃下与NOx的反应性。尖晶石型铁氧体是300 ℃下CO ↓ [2] D_2分解的活性物质。它价格便宜，对环境无害。已知尖晶石铁氧体在低于400 ℃下的氧化形成氧过量的尖晶石铁氧体，其通过用CO或H2O D22 H2O D2还原或在300 ℃下的抽空处理而容易地还原成化学计量的尖晶石铁氧体。结果表明，在65 ℃下湿法制备的磁铁矿、Ni（II）取代磁铁矿、Zn（II）取代磁铁矿和Co（II）取代磁铁矿在此温度范围内均能通过间歇反应和流动反应还原NO。反应伴随着尖晶石型铁氧体的氧化进行。Ni（II）取代的磁铁矿铁氧体对NO还原的反应速率在所制备的铁氧体中表现出最高的，并且随着Ni与Fe的摩尔比的增加而增强，这表明Ni（II）离子促进了尖晶石铁氧体表面上的NO还原。为了进一步制备具有反应活性的尖晶石型铁氧体，我们对超细尖晶石型铁氧体的湿法合成进行了研究。通过调节氧化速率、pH值等条件，在室温下成功地合成了尖晶石型铁氧体，得到了平均粒径小于100 nm的尖晶石型铁氧体。但合成超细尖晶石铁氧体的反应条件尚不清楚，需要进一步研究。在下一阶段，我们将研究使用化学和固体电解质反应的反应铁氧体的再活化。