权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Oxygen Semipermeable Membrane Using Mixed Conductive Perovskite-Type Oxide

使用混合导电钙钛矿型氧化物开发氧气半透膜

基本信息

批准号：
62850145
负责人：
YAMAZOE Noboru
金额：
$ 4.67万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850145/
关键词：
Perovskite-type oxide Oxygen semipermeable membrane Mixed conductor ガス分離

项目摘要

For the development of an oxygen semipermeable membrane using mixed conductive perovskite-type oxides, investigated were the material searching, the evaluation of mixed conductivity and the fabrication of pracical device. 21 sorts of LnCoO_3 based perovskite-type oxides were prepared and their oxygen semipermeabilities were examined systematcally with regard to a partial substitution of A and B site cations. Among them, La_<0.6>Sr_<0.4>Co_<0.8>B'_<0.2>O_3 (B'=Cu, Ni), Gd_<0.6>Sr_<0.4>CoO_3, La_<0.2>Sr_<0.8>Co_<0.8>Fe_<0.8>O_3 and Gd_<0.2>Ba_<0.8>Co_<0.7>Cu_<0.2>Fe_<0.1>O_3 showed an excellent oxygen semipermeability and they were found to be suitable for the oxygen semipermeable membrane. By the way, La_<1-x>Sr_XCo_<1-r>Fe_yO_3 was found to show a good mixed conductivity by means of four probe ionic dc and ordinary four-probe dc techniques. La_<0.6>Sr_<0.4>CoO_3 (LSCO) was used for the fabrication of practical device. Of the several methods attempted, sintering of a compact of LSCO pow … More der which was calcined at 1400 ゜C and sieved to 44-74 mum gave discs having a high air permeability through penetrating channels consisting of a network of intergranular pores. The disc appeared to be suitable as a porous support on which oxygen semipermeable thin membrane was formed. The preparation of dense thin membrane on the porous support was achieved by using a spray deposition-technique consisted of a repetition of sprying an ethanol suspension of fine LSCO particles and sintering for 1h in air. Under the condition of 2.0 mg/cm^2 of LSCO per one spray and 1400 ゜C for sintering, the open pores of porous support were progressively covered with the deposited layer with repeating the procedure and the almost completely dense overlayer of about 15 mum thickness was obtained after repetition by four times. The thin film device fabricated by above-mentioned procedure showed a higher rate of oxygen semipermeation than that of the dense sintered disc with the thickness of 1.5 mm, although the rate was lower than was expected. Control of the chemical composition at the film surface as well as the dispersion of open pores of the substrate was suggested to be important for further revisions. Less

针对钙钛矿型混合导电氧化物氧半透膜的开发，研究了材料的选择、混合电导率的评价和实用器件的制作。制备了21种LnCoO_3基钙钛矿型氧化物，系统地研究了A、B位阳离子的部分取代对其氧半透性的影响。其中，La_&lt；0.6&gt；Sr_&lt；0.4&gt；Co_&lt；0.8&gt；B‘_&lt；0.2&gt；O_3(B’=Cu，Ni)，Gd_&lt；0.6&gt；Sr_&lt；0.4&gt；CoO_3，La_&lt；0.2&gt；Sr_&lt；0.8&gt；Co_&lt；0.8&gt；Fe_&lt；0.8&gt；O_3和Gd_&lt；0.2&gt；Ba_&lt；0.8&gt；Co_&lt；0.7&gt；Cu_&lt；0.2&gt；Fe_&lt；0.1&gt；O_3表现出良好的氧气半透过性，适合用作氧气半透膜。另外，用四探针离子直流和普通四探针直流法发现La_&lt；1-x&gt；sr_xCo_&lt；1-r&gt；Fe_yO_3具有良好的混合导电性。用La_&lt；0.6&gt；Sr_&lt；0.4&gt；CoO_3(LSCO)制作了实用的器件。在尝试的几种方法中，烧结LSCO粉末…的压坯此外，在1400゜C下焙烧并筛分至44-74um的DER可通过由晶间孔隙网络组成的穿透通道获得具有高透气性的圆盘。该圆盘似乎适合作为多孔载体，在其上形成氧气半透膜。采用喷雾沉积技术在多孔载体上制备了致密的薄膜，该技术包括重复喷洒乙醇悬浮液、细颗粒LSCO颗粒和在空气中烧结1h。在LSCO2.0 mg/cm2/1次喷雾和1400゜C烧结条件下，重复4次，在多孔载体的开口气孔上逐渐覆盖沉积层，得到厚度约为15微米的几乎完全致密的覆盖层。与厚度为1.5 mm的致密烧结盘相比，采用上述工艺制备的薄膜器件具有更高的氧气半渗透速率，尽管其速率低于预期。控制薄膜表面的化学成分以及衬底开口气孔的分散被认为是进一步修订的重要内容。较少