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.

本研究通过三种方法提高透氧性：（1）非对称膜的制备，（2）制备方法的优化，（3）新材料的研究（1）我们研究了SrFeCo_<0.5>O_x（的制备）。 SFC2）多孔α-氧化铝基底上的非对称膜虽然通过重复制备获得了气密膜，但由于固态反应，这些膜并未表现出高氧通量。为了防止这种问题，我们建立了一种新的制备方法，用SFC2粉末制备致密层，并用SFC2粉末与乙基纤维素混合制备多孔支撑层。将SFC2粉末和混合物同时压制和煅烧，通过该方法制备的致密层的最小厚度为0.1mm，非对称膜具有比对称膜更大的氧通量。 (2)用三种不同方法制备的粉末合成SFC2膜，(a)固态反应法、(b)蒸发干燥法和(c)柠檬酸盐和氧络合法。氧通量按(a)<(b)<(c)的顺序增加，研究了制备条件对氧通量的影响，通过重复可以提高氧通量。 (3)La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_<3-δ>被另一种稀土元素如取代。 Pr、Nd、Sm 比 La_<0.4>Ba_<0.6>Fe_<0.8>Co_<0.2>O_<3-δ> 更高的氧通量然而，尚未获得膜。现在我们通过应用于膜反应器来评估本研究中制备的膜。