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.

在本研究项目中，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)的透氧性能。研究发现，即使在室温下，稀土金属和碱土金属部分取代 Ba 也能稳定立方钙钛矿结构。还发现在较低温度下出现氧气渗透。用Ni、Mg或Zn部分替代Fe对于提高透氧性非常有效。 (2)Fe/Mn基钙钛矿表现出透氧性和高还原稳定性，可作为催化甲烷部分氧化和甲烷还原NO的膜反应器中相当稳定的透氧膜。此外，Ba/Sr/Fe基钙钛矿被发现是最优异的透氧材料之一。 (3)掺杂Sr和Fe的LaGaO_3钙钛矿氧化物(LSGF)具有较高的电导率、透氧速率和化学稳定性,该LSGF可用于CH_4部分氧化的透氧膜。在较宽的 Po_2 范围和温度下，LSGF 中空穴传导占主导地位。此外，研究了各种氧化物中的氧渗透率，发现掺杂Gu的Pr_2NiO_4具有从空气到He的高氧渗透率。 (4)尝试制备多孔盘并在其上制备薄膜以提高混合导电钙钛矿型氧化物的透氧性。发现草酸盐前驱体方法即使在高温下也能产生孔径分布窄的多孔盘。通过草酸盐前驱体方法获得的圆盘表现出高氮渗透性，适合实际应用。