Construction of new electrochemical-membrane-reactor system for simulutaneous environmental purification/chemical conversation

同步环境净化/化学对话的新型电化学膜反应器系统的构建

基本信息

批准号：
13355032
负责人：
MIURA Norio
金额：
$ 32.12万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13355032/
关键词：
Mixed conductor Perovskite Membrane reactor Oxygen permeating membrane Environmental purification Partial oxidation of methane Nitrogen oxide メンブレンリアクタ窒素酸化物混合誘導体 NO_X分解 NO_x分解

项目摘要

In this research project, we investigated each process of the newly proposed electrochemical membrane-reactor system and obtained the following results.(1)Oxygen permeation property of the barium ferrites(Ba-Fe system) was examined. Partial substitution of Ba by rare earth metals as well as alkaline earth metals was found to stabilize cubic perovskite structure even at room temperature. It was also found that oxygen permeation appeared at lower temperature. Partial substitution of Fe by Ni,Mg,or Zn was quite effective for improvement of oxygen permeability. (2)Fe/Mn-based perovskites exhibited oxygen permeability and high stability against the reduction, and could be used as quite stable oxygen permeable membranes in the membrane reactors catalyzing the partial oxidation of methane and the reduction of NO by methane. In addition, Ba/Sr/Fe-based perovskites was found to be one of most excellent oxygen permeable materials. (3)Perovskite oxide of LaGaO_3 doped with Sr and Fe(LSGF) was found to exhibit high electrical conductivity, oxygen permeation rate and chemical stability, and this LSGF could be used for oxygen permeation membrane for CH_4 partial oxidation. Hole conduction is dominant in LSGF in wide Po_2 range and temperature. In addition, oxygen permeation rate in various oxides was investigated and Pr_2NiO_4 doped with Gu was found to give high oxygen permeation rate from air to He. (4)Preparation of porous disk was attempted to fabricate thin films on it for the purpose of improving oxygen permeability of mixed conductive perovskite-type oxides. Oxalate precursor method was found to give porous disks with a narrow distribution of pore diameter even at elevated temperature. The disks obtained by the oxalate precursor method showed high nitrogen-permeability feasible for practical applications.

在该研究项目中，我们研究了新提出的电化学膜反应器系统的每个过程，并获得了以下结果。（1）检查了钡铁氧体（BA-FE系统）的氧渗透特性。发现BA通过稀土金属以及碱土金属的部分取代，即使在室温下，也可以稳定立方钙钛矿结构。还发现氧渗透在较低的温度下出现。 Ni，Mg或Zn对Fe的部分取代对于改善氧气渗透性非常有效。（2）基于Fe/Mn的钙钛矿表现出氧气渗透性和对还原的高稳定性，并且可以用作膜反应器中稳定的氧气渗透膜，可催化甲烷的部分氧化和甲烷的NO减少。此外，发现基于BA/SR/Fe的钙钛矿是最出色的氧气渗透材料之一。（3）掺杂Sr和Fe（LSGF）的Lagao_3的钙钛矿氧化物表现出高电导率，氧渗透率和化学稳定性，并且该LSGF可用于CH_4部分氧化的氧气渗透膜。孔传导在LSGF的较大PO_2范围和温度下是主要的。此外，研究了各种氧化物中的氧渗透速率，并发现用GU掺杂的Pr_2nio_4从空气到HE的氧气渗透速率很高。（4）试图在其上制备多孔磁盘在其上制造薄膜，目的是改善混合导电性钙钛矿型氧化物的氧气通透性。发现草酸盐前体法可以使多孔磁盘具有狭窄的孔直径，即使在升高温度下也是如此。通过草酸盐前体法获得的磁盘显示出很高的氮渗透性对于实际应用可行。