|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials for Energy Conversion and Storage
||In Situ Imaging and Spectroscopy of Carbon Deposition on a Ni/CeO2 Catalyst
||Ethan L Lawrence, Peter A Crozier
|On-Site Speaker (Planned)
||Ethan L Lawrence
Long-term stability of solid oxide fuel cells (SOFC) may be limited by carbon deposition onto the active anode catalyst, causing deactivation of the ceramic-metal (cermet) composite catalyst structure. In situ studies detailing fundamental processes occurring during carbon deposition are essential to designing better catalysts. An FEI Titan environmental transmission electron microscope (ETEM) was used to study gas-solid interactions of a model Ni/CeO2 catalyst with two carbon source gases, ethane (C2H6) and ethylene (C2H4), to gain insight into carbon deposition processes relevant to SOFCs. During gas exposure, in situ electron energy-loss spectroscopy (EELS) was used to monitor the valence state of Ce3+/4+, which varies with the oxygen content of the ceria. Ce valence can thus be used to interpret carbon deposition behaviors in terms of oxygen deficiency of the ceria support. In situ results and spectroscopic data highlighting the relationship between the metal-support interaction and carbon deposition will be presented.