Fuel flexibility is one of the main advantages of Solid Oxide Fuel Cells (SOFCs) technology and is related to the high operating temperatures (773-1273K). SOFCs can be fed by methane, higher hydrocarbons and also bio-gas produced by the anaerobic fermentation of wastes and biomass. The composition range of purified bio-gas is 60-50% of CH4 and 50-40% of CO2. Thus, in principle biogas-fueled SOFCs can be operated with internal dry reforming reaction (DMR) (equation 1) by the presence of CO2 as reforming agent [1-3]. (1) DRM is commonly used for syn-gas production, thus catalysts are specially designed for this purpose. However, being generally composed by low metal loading and support with negligible ion-conduction they are unsuitable for the use in SOFCs anodes. Therefore, development of anodes with high activity toward the dry reforming of methane is still challenging. One way may be the preparation of cermets composed by low carbon sensitive Ni based- alloys [4] and highly ion-conductive electrolytes such as GDC [5]. In particular, among the oxygen-ion conducting electrolytes La0.8Sr0.2Ga0.8Mg0.2O3- (LSGM) showed a large ionic conductivity (ca. 0.02 Scm-1 at 600 oC), although the formation of insulating secondary phases and cations interdiffusion across the interface with electrodic layers have been often observed t temperatures ≥1100 °C [6]. Thus, the implementation of such Ni-based alloys requires the preparation of LSGM scaffold to be impregnated by the active components. In this work Ni, NiCo and NiCu supported on LSGM commercial powder were prepared by a conventional wet impregnation method. The catalysts were characterized by XRD, H2-TPR, CO2-TPD, BET and SEM. The catalytic activity for the DRM was studied into a quartz tubular reactor as a function of temperature and CH4/CO2 molar ratio at high GHSV (120000mLg-1h-1) simulating the condition presents in the anodic scaffold of a anode supported LSGM based SOFCs. The catalytic activity increased in the order NiCu
Luisetto, I., Salehi, Z., Zurlo, F., Basoli, F., Tuti, S., Di Bartolomeo, E. (2014). Ni-(Co;Cu) bimetallic catalyst supported on LSGM: catalytic performances toward bio-gas dry reforming for SOFCs anode implementation.
Ni-(Co;Cu) bimetallic catalyst supported on LSGM: catalytic performances toward bio-gas dry reforming for SOFCs anode implementation
Luisetto I;Tuti S;
2014-01-01
Abstract
Fuel flexibility is one of the main advantages of Solid Oxide Fuel Cells (SOFCs) technology and is related to the high operating temperatures (773-1273K). SOFCs can be fed by methane, higher hydrocarbons and also bio-gas produced by the anaerobic fermentation of wastes and biomass. The composition range of purified bio-gas is 60-50% of CH4 and 50-40% of CO2. Thus, in principle biogas-fueled SOFCs can be operated with internal dry reforming reaction (DMR) (equation 1) by the presence of CO2 as reforming agent [1-3]. (1) DRM is commonly used for syn-gas production, thus catalysts are specially designed for this purpose. However, being generally composed by low metal loading and support with negligible ion-conduction they are unsuitable for the use in SOFCs anodes. Therefore, development of anodes with high activity toward the dry reforming of methane is still challenging. One way may be the preparation of cermets composed by low carbon sensitive Ni based- alloys [4] and highly ion-conductive electrolytes such as GDC [5]. In particular, among the oxygen-ion conducting electrolytes La0.8Sr0.2Ga0.8Mg0.2O3- (LSGM) showed a large ionic conductivity (ca. 0.02 Scm-1 at 600 oC), although the formation of insulating secondary phases and cations interdiffusion across the interface with electrodic layers have been often observed t temperatures ≥1100 °C [6]. Thus, the implementation of such Ni-based alloys requires the preparation of LSGM scaffold to be impregnated by the active components. In this work Ni, NiCo and NiCu supported on LSGM commercial powder were prepared by a conventional wet impregnation method. The catalysts were characterized by XRD, H2-TPR, CO2-TPD, BET and SEM. The catalytic activity for the DRM was studied into a quartz tubular reactor as a function of temperature and CH4/CO2 molar ratio at high GHSV (120000mLg-1h-1) simulating the condition presents in the anodic scaffold of a anode supported LSGM based SOFCs. The catalytic activity increased in the order NiCuI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
