| 초록 |
The performance of Ni/CeO2-Al2O3 catalysts in gasoline autothermal reforming (ATR) for hydrogen production was investigated. The catalysts were prepared by modifying Al2O3 with different amounts of CeO2, followed by Ni impregnation, and were used for ATR using as a model compound representing gasoline. Reaction tests were conducted using a feed stream of H2O/C/O = 3/3/0.25 at 600 °C for 24 h, which caused the severe deactivation of catalyst by coke formation. In the case of Ni/CeO2-Al2O3, 92% conversion was maintained during the test period of 24 h. Hydrogen production was larger for Ni/CeO2-Al2O3 than for Ni/Al2O3. The results of Temperature-programmed reduction indicated that CeO2 addition promoted the reduction of NiO and prevented the formation of NiAl2O4 in the catalysts. The elemental analysis and temperature-programmed oxidation of deactivated catalysts showed that Ni/CeO2-Al2O3 produced less amounts and different types of coke on the catalyst surface. Consequently, the CeO2 modification leads to an increase in H2 production and coke resistance due to enhancement in NiO reduction and coke gasfication. |
