| 초록 |
In this study, successively impregnated Ni/CeZrOx-Al2O3 catalysts with different Ni contents were prepared to strengthen hydrogen production efficiency and to enhance the stability due to the suppression of carbon deposits. The ESR reaction was tested at 550 oC and 750 oC. Additionally, the effect of catalytic active sites on the ESR reaction routes was investigated. From BET, yNi/CZ-Al catalysts remain a large surface area. H2-TPR shows the effect of Ni loading on the interactions between Ni-CZ and Ni-Al2O3. NiO species are embedded deeply in the Al2O3 lattic to attenuate the dehydration that occurs on Al2O3. In addition, the interaction between Ni and CZ solid solution enhances the oxygen vacancy of the CZ solid solution. The Ni active sites accelerate the reforming of the activated steam so that the hydrocarbon can be converted to final SR products and at the same time reduce the generation of carbon deposits. On the other hand, at 750 oC, CO becomes one of the main factors to generate coke since RWG is significant at 750 oC. However, the successive impregnation of Ni and CZ into the support improves the WGS reaction, resulting in a high yield of H2 even at 750 oC. |
