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首页> 美国政府科技报告 >Development of mixed-conducting ceramic membranes for converting methane to syngas
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Development of mixed-conducting ceramic membranes for converting methane to syngas

机译：开发用于将甲烷转化为合成气的混合导电陶瓷膜

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The abundantly available natural gas (mostly methane) discovered in remote areas has stimulated considerable research on upgrading this gas to high-value- added clean-burning fuels such as dimethyl ether and alcohols and to pollution- fighting additives. Of the two routes to convert methane to valuable products direct and indirect, the direct route involving partial oxidation of methane to syngas (CO + H(sub 2)) by air is preferred. Syngas is the key intermediate product used to form a variety of petrochemicals and transportation fuels. This paper is concerned with the selective transport of oxygen from air for converting methane to syngas by means of a mixed-conducting ceramic oxide membrane prepared from Sr-Fe-Co-O oxide. While both perovskite and nonperovskite type Sr-Fe-Co-O oxides permeate large amounts of oxygen when the membrane tube is subjected to oxygen pressure gradients, the work shows that the nonperovskite SrFeCo(sub 0.5)O(sub x) exhibits remarkable stability during oxygen permeation. More particularly, extruded and sintered tubes from SrFeCo(sub 0.5)O(sub x) have been evaluated in a reactor operating at (approx) 850 C for conversion of methane into syngas in the presence of a reforming catalyst. Methane conversion efficiencies of (approx) 99% were observed. In addition, oxygen permeability of SrFeCo(sub 0.5)O(sub x) was measured as a function of oxygen partial pressure gradient and temperature in a gas-tight electrochemical cell. Oxygen permeability has also been calculated from conductivity data and the results are compared and discussed.

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