摘要: Direct carbon solid oxide fuel cell (DC-SOFC) is a potential technology for generating electricity from solid carbon fuel with high conversion efficiency and low pollution. In this study, the use of industrial coke as a fuel for a direct carbon solid oxide fuel cell (DC-SOFC) was investigated. Tubular yttrium-stabilized zirconia (YSZ) electrolyte-supported solid oxide fuel cells (SOFCs) with a cermet of silver and gadolinium-doped ceria (Ag-GDC) as electrode material were fabricated. Raman spectroscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy were applied to characterize the investigated coke fuels. It was observed that the coke fuel wa micron-sized particles with many structural defects, which favored the Boudouard reaction occurring in a DC-SOFC. A peak power density of 149 mW/cm2 at 850 ℃ was observed for pure coke fuel, and it improved to 217 mW/cm2 when a Fe-based catalyst was added to enhance the Boudouard reaction. The degradation performance of the DC-SOFC during a discharging test was analyzed according to the electrochemical characterization and emitted gas measurements. The performed test supported the feasibility of using coke as fuel in an all-solid-state DC-SOFC to generate electricity.
摘要: Al-based layered double hydroxides and corresponding mixed oxides were prepared and used as the supports for the Pt based catalysts; their catalytic performance in the hydrodeoxygenation (HDO) of p-cresol was then investigated. The results indicate that the catalytic performance of Pt based catalysts is related to the composition and structure of the support; Pt directly supported on the Al-based layered double hydroxides exhibits higher activity in p-cresol HDO than that supported on corresponding mixed oxides. Especially, for the HDO at 275 ℃ and 2 MPa for 1 h, the conversion of p-cresol over Pt-Ni-Al-H is 99.8%, with a selectivity of 1.4% to toluene, whereas the selectivity to toluene over Pt-Zn-Al-H reaches 84.1%. Moreover, the Pt based catalysts are also active for the dehydrogenation of methylcyclohexane to toluene, which can effectively reduce the hydrogen consumption in HDO.