Rate equation of steam-methane reforming reaction on Ni-YSZ cermet considering its porous microstructure

7th European Thermal-Sciences Conference

Sugihara, S.^1,2 ; Kawamura, Y.^1 ; Iwai, H.^1

Department of Aeronautics and Astronautics, Kyoto University, Kyoto

615-8540, Japan^1

Corporate RandD Div.2, DENSO CORPORATION, Aichi

448-8661, Japan^2

关键词: Contact surface;    Ni-YSZ cermets;    Porous microstructure;    Positive dependence;    Rate equations;    Reaction characteristics;    Steam partial pressure;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032147/pdf
DOI  :  10.1088/1742-6596/745/3/032147

来源: IOP

【 摘 要 】

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.