Tatsuya SAWAHATA
Temperature Programmed Desorption Analysis of Adsorption Gases at Cerium Oxide Cermet Particles
Kazunori SATO
Direct use of methane (CH4) in solid oxide fuel cells (SOFCs) is very attractive for an efficient generation of electric energy. However, thermal decomposition of CH4 produces carbon, which degrades the performance of SOFCs, makes difficult for the development of the direct use of CH4. In order to enhance the activity of the anodic oxidation of CH4, the Ni-YSZ (yttria-stabilized zirconia) added with CeO2 was found to be useful. In the present study, I focused on the adsorptive property of CH4 molecules at the surface of Ni (or Co)-YSZ (CeO2) cermet powders in order to investigate the effect of oxide particles bonded to Ni (or Co) metal particles. Temperature-programmed desorption (TPD) analysis was carried out for Ni-CeO2, Ni-YSZ, Co-CeO2, and the Co-YSZ cermet samples. It was found that CeO2 particles increase the desorption temperature of CH4 molecules from the surface of Ni particles. However, they decrease the desorption temperature of CO. The TPD analysis has revealed that the adsorbed behavior of CH4 and CO molecules at the surface of metal particles was significantly affected by the oxide particles. The results indicate that microstructures of the cermet samples can affect the adsorbed behavior of CH4 and CO molecules.
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