Syngas Production by Partial Oxidation of Methane with Oxygen Permeable Membrane

透氧膜部分氧化甲烷生产合成气

基本信息

批准号：
10305061
负责人：
KIKUCHI Eiichi
金额：
$ 22.4万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

项目摘要

In this study, oxygen permeability was improved by three methods (1)Preparation of asymmetric membranes, (2)Optimization of preparation methods, and (3)Investigation of new materials. (1)We investigated the preparation of SrFeCo_<0.5>O_x(SFC2) asymmetric membranes on porous α-alumina substrates. Though gas-tight membranes were obtained by repeating the preparation, these membranes did not show high oxygen flux due to solid-state reaction between membrane materials and substrates or due to differences of compositions from SFC2. To prevent such problems, we established a new preparation method. The dense layer was prepared with SFC2 powder, and the porous support layer was prepared using SFC2 powder mixed with ethyl cellulose. The SFC2 powder and the mixture were simultaneously pressed and calcined. The minimum thickness of the dense layer prepared by this method was 0.1 mm. The asymmetric membranes gave greater oxygen flux than the symmetric membrane. And the oxygen fluxes through these membranes increased with decreasing the thickness of dense layer. (2)SFC2 membranes were synthesized with powders prepared by three different methods, (a)a solid-state reaction method, (b)an evaporation-to-dryness method, and (c)a combined citrate and EDTA. Complexing method. Oxygen fluxes increased in the order of (a)<(b)<(c). Influence of preparation conditions on oxygen flux was investigated. The oxygen flux could be improved by repeated calcination and grinding of parent powder or by sintered at a higher temperature. (3)La in La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_<3-δ> was substituted by another rare earth element such as Pr, Nd, Sm. The higher oxygen flux than La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_<3-δ> membrane, however, was not obtained. Now we evaluating membranes prepared in this study by applying to a membrane reactor.

在这项研究中，通过三种方法（1）制备不对称膜，（2）优化制备方法以及（3）研究新材料的方法，改善了氧气渗透率。（1）我们研究了srfeco_ <0.5> O_x（SFC2）在多孔α-铝底物上的不对称膜的制备。尽管通过重复制剂获得了气密膜，但由于膜材料和底物之间的固态反应或由于SFC2的组成差异，这些膜并未显示出很高的氧气通量。为了防止此类问题，我们建立了一种新的准备方法。用SFC2粉末制备致密层，并使用与乙基纤维素混合的SFC2粉末制备多孔支撑层。将SFC2粉末和混合物简单地压缩并钙化。该方法制备的密集层的最小厚度为0.1 mm。不对称膜比对称膜更大。通过这些膜的氧通量随着致密层的厚度减小而增加。（2）通过三种不同方法制备的粉末合成了SFC2膜，（a）一种固态反应方法，（b）经济对干燥方法，以及（c）柠檬酸盐和EDTA合并。复合方法。氧通量以（a）<（b）<（c）顺序增加。研究了制备条件对氧气通量的影响。可以通过重复计算和磨碎母粉或在较高温度下烧结来改善氧通量。（3）la_ <0.4> ba_ <0.6> fe_ <0.8> co_ <0.2> o_ <3-Δ>用另一个稀土元素（例如pr，nd，sm）代替。但是，尚未获得高于LA_ <0.4> BA_ <0.6> Fe_ <0.8> CO_ <0.2> O_ <3-uguemmbrane的氧气通量。现在，我们通过应用于膜反应器来评估本研究中制备的膜。