| 초록 |
The loading amount of Ba promoter has controlled from 0 wt.% to 3 wt.% in 15 wt.% Co/CeO2 catalyst system and applied to the high temperature water-gas shift reaction using waste-derived synthesis gas. The catalysts are prepared by the incipient wetness co-impregnation method and characterized through various techniques such as X-ray diffraction, Brunauer–Emmet–Teller measurements, CO–chemisorption, H2–temperature programmed reduction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Doping of proper amount (1–2 wt.%) of Ba promoter improves the reducibility of the catalyst and enhances the sintering resistance. However, doping of excess amount (≥ 3 wt.%) weakens the reducibility of the catalyst, resulting to the instability of the active phase (Co0). Overall, 1% BaCo/CeO2 catalyst shows the best catalytic performance even at a very high gas hourly space velocity of 143,000 h–1 due to the strong resistance to the sintering and high stability of the Co0. |
