Abstract
The steam-methane reforming reaction on a Ni-YSZ (yttria-stabilized zirconia) cermet was experimentally investigated in the temperature range of 650 to 750°C. We examined the effects of the partial pressures of methane and steam in the supply gas on the reaction rate. The porous microstructure of the Ni-YSZ cermet was quantified using an FIB-SEM technique. A power-law-type rate equation was obtained on the basis of the unit surface area of the Ni-pore contact surface in the cermet. The kinetics indicated a strong positive dependence on the methane partial pressure and a negative dependence on the steam partial pressure, in good agreement with the literature. The obtained rate equation successfully predicted the reaction characteristics of Ni-YSZ cermets having different microstructures.
Highlights
Solid oxide fuel cell (SOFC) systems are recognized as a promising technology owing to their high generation efficiency of more than 50%
The properties of the microstructure quantified by the focused ion beam scanning electron microscopy (FIB-SEM) technique are shown in table 2, as well as some of the corresponding fabrication data
A rate equation for steam-methane reforming based on the Ni-YSZ anode microstructure was investigated in combination with an FIB-SEM technique
Summary
Solid oxide fuel cell (SOFC) systems are recognized as a promising technology owing to their high generation efficiency of more than 50%. The overall reformation process of methane rapidly consumes approximately 60% of the heat generated in the cell under the conditions of 75% fuel utilization, a temperature of 700°C and 55% DC efficiency [1]. In exchange for these advantages, a strong temperature gradient may occur on the cell surface that can cause cell fracture and gas seal leakage. Control of the internal reforming reaction is critically important
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