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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.

本研究从三个方面来提高透氧性能：（1）非对称膜的制备，（2）制备方法的优化，（3）新材料的研究。(1)We研究了<0.5>在多孔α-Al 2 O3衬底上制备SrFeCo_ O_x（SFC 2）非对称膜的方法。虽然通过重复制备获得气密膜，但是由于膜材料和基底之间的固态反应或由于与SFC 2的组成差异，这些膜没有显示高的氧通量。为了防止这些问题，我们建立了一种新的制备方法。用SFC 2粉末制备致密层，用SFC 2粉末与乙基纤维素混合制备多孔支撑层。将SFC 2粉末和混合物同时压制和煅烧。通过这种方法制备的致密层的最小厚度为0.1 mm。非对称膜比对称膜提供更大的氧通量。随着致密层厚度的减小，氧透过膜的通量增加。（2）采用固相反应法、蒸发干燥法和柠檬酸盐-EDTA混合法制备了SFC 2膜。复合方法。氧通量的增加顺序为（a）<（B）<（c）。研究了制备条件对氧通量的影响。通过对母粉的反复煅烧和研磨或在较高温度下烧结可提高氧通量。(3)La在La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_（3-δ）中，La_ Ba_ Fe_ Co_ O_（3-δ）被Pr、Nd、Sm等稀土元素取代。但氧通量并不高于La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_<3-δ>膜。现在，我们通过将本研究中制备的膜应用于膜反应器来评估膜。