Fabrication and characteristics of planar-type methane reformer using ceria-based oxygen permeable membrane

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• 作者：Hitoshi Takamura ; Masayuki Ogawa ; Koichi Suehiro ; Hiroo Takahashi ; Masuo Okada
• 关键词：Partial oxidation of methane ; Tape-casting ; Electrical conductivity ; Porous oxygen sensor ; Young's modulus ; Fracture toughness
• 刊名：Solid State Ionics
• 出版年：2008
• 出版时间：30 September 2008
• 年：2008
• 卷：179
• 期：27-32
• 页码：1354-1359
• 全文大小：320 K

文摘

This paper describes the fabrication of a planar-type methane reformer based on a composite-type oxygen permeable membrane and its reforming properties. The membrane reformer module comprising of (Ce_0.85Sm_0.15)O₂–15 vol. % MnFe₂O₄ and a ferric stainless steel separator with a same thermal expansion coefficient was successfully developed. For the reformer module, high CH₄ conversion, CO and H₂ selectivity of 96 % , 84 % , and 89 % were achieved, respectively. Based on an electrical conductivity isotherm, joule heat caused by oxygen permeation in the module was estimated to be approximately 8.4 W. In addition, the effect of ZrO₂-doping on the mechanical properties and oxygen permeability of the composite material was investigated. The highest Zr-content sample, (Ce_0.85Sm_0.15)_0.2Zr_0.8O₂–15 vol. % MnFe₂O₄, showed a tetragonal structure. As a result of the crystal structural change, superior mechanical properties of Young's modulus of 337 GPa and fracture toughness of 2.8 MPa m^1/2 were obtained.