| 초록 |
For a dry reforming reaction (DRM), Ni-based catalysts have many disadvantages due to the thermal instability by a sintering of the supported Ni nanoparticles (NPs) to form less active aggregates at a high temperature as well as significant coke deposition compared to the precious-metal based ones. In order to lessen these limitations, oxophilic Co NPs can be applied by preparing Ni-Co bimetallic catalysts not only for an enhanced activity but also sustained stability of the catalysts by suppressing the aggregations of Ni NPs as well as coke formations. However, due to an inherent limitation of the heterogeneity of supported active metals, the intrinsic roles of Co to Ni are still unclear. In this study, the model nano-reactor composed of the SiO2-encapsulated Ni NPs (Ni@SiO2) and bimetallic ones (Ni-Co@SiO2) were prepared, which was capable to retain the pristine particle size under a high temperature DRM reaction with stable catalytic activity. |
