| 초록 |
This study focused on identifying the active sites as well as the key step in the overall ESR reaction. The use of new promoter species, such as V oxide with Co as the main catalytic ingredient was attempted for high hydrogen generation in ESR. Co and V ions with various molar rations were together impregnated over the surface of SBA-15 support. The physicochemical properties of the catalysts were examined by X-ray diffraction, transmission electron microscopy, CO-TPD, H2-TPR, TPO, and X-ray photon spectroscopy analyses. The temperature-on-stream activity over Co/SBA-15, Co2V1/SBA-15, Co1V1/SBA-15, Co1V2/SBA-15, and V/SBA-15 at GHSV 6000 h-1are compared. The conversions over all catalysts exceeded 80% from 400 oC, and this high performance was maintained to 800 oC. Hydrogen production increased gradually over the temperature range of 350-800 oC over Co-impregnated catalyst. According to V addition, the reforming temperatures were shifted to the higher but hydrogen evolution was maximized over Co1V1/SBA-15 to reach 97% at 700 oC. |
