| 초록 |
The intensively coke deposition and reforming at high temperature in the conventional Ni/γ-Al2O3 catalyst, which resulted in rapidly catalytic deactivation and reducing H2 production from hydrocarbon steam-reforming reaction under solid oxide fuel cell (SOFC) operating conditions. Steam reforming reactions of butane over bimetallic Ag/Ni or Ni/Ag of same amount loaded MgAl2O4 catalysts synthesized by an impregnation approach were studied in this study to improve the mentioned upon. The Ag loaded catalyst on the external surface provided significantly higher reforming reactivity compared to the conventional Ni/MgAl2O4. The main products from steam reforming over Ni/MgAl2O4 catalyst without Ag component were H2, CO, CO2, and CH4 with a small amount of C2~. However, the addition of Ag was found to reduce the degree of carbon deposition and improve H2 product selectivity by completely eliminating C2~ formation regardless of below 750oC. The catalytic performances were different according to the impregnating order of added metal precursors in each step: the H2 production maximally reached to 0.23mol over Ag/Ni/MgAl2O4 at 800oC, and however it decreased to 0.13mol at 600oC over Ni/Ag/MgAl2O4 . |
