OP-II-3

OP-II-12was connected to G.C. via sampling valve. Oxygen (1.58×10 -5 mol/s) was fed intocathode side.Results and DiscussionFigure 2 shows the partial oxidationof methane with IT-SOFC reactor.Conversion increased above 1000K.Figure 3 shows the oxygen TPD spectraof NiLi/Al 2 O 3 anode under various rate oftemperature increase. Desorption ofoxygen with activation energy higherthan 240 kJ/mol was observed above800K. Figure 4 shows TPD spectra ofLSGM electrolyte powder. Desorption ofoxygen with activation energy of 240kJ/mol was observed above 800K.Figure 5 shows the permeation ofoxygen from fuel cell unit. Permeationrate was increased above 1000Kshowing that active oxygen observed inFigs. 3 and 4 might permeate throughthe unit. This behaviour agrees withmethane oxidation activity shown in Fig.2. These results indicate thattemperature programming method isuseful to elucidate the behaviour ofactive oxygen species.Fig. 2. Methane oxidation with SOFC reactorFig. 3. TPD of NiLiAlO anode catalystReferences[1] T. Tagawa, et Al., Chem. Eng. Sci., (1999)54, 1553.[2] T. Tagawa, et al., Chem. Eng. Journal,(2003) 93,3.[3] T. Tagawa, et al., Solid State Ionics, (1998)106, 227).[4] K. K. Moe, et. Al., J. Ceram. Soc. Japan,(1998) 106,754.[5] A. Carrillo, T. Tagawa and S. Goto, Mat.Res. Bull., (2001) 36,1017.[6] M. Ito, T. Tagawa and S. Goto, J. JapanPetro. Inst., (2001) 44,371.[7] T. Tagawa, et al., Proc.ICIM-9, (2006), 579.AcknowledgementsFig. 4. TPD of LSGM powderFig. 5. TPD of NiLiAlO/LSGM/LSC unitThe authors are grateful to Japan Fine Ceramics Co. for providing LSGM membrane andto Mr. Hajime Itoh of Nagoya University for his technical assistance.121