| 초록 |
The catalytic CO2 reforming of methane possesses an eco-friend implication to produce syngas (H2 and CO) by converting both major greenhouse gases CH4 and CO2. However, the catalyst deactivation by sintering and carbon coking is the major issue to implement scale-up process in real applications. In this study, we prepared one-pot synthesized catalysts consisting of single core@shell and multi-layered catalysts sequentially synthesized (dual and triple-layered core@shell), while keeping a total loading of Ni (ca. 10 wt.%) in the sample. The Ni impregnated on SiO2 (Ni/SiO2) catalyst was also compared. The CO2 reforming of methane reaction was carried out under the steady-state condition from 650 to 850 ℃ with a mixture of CH4 and CO2 in Ar balance (CH4:CO2:Ar=3:3:4). The catalytic performance is in the following order: Dual layered Ni@SiO2 > triple-layered Ni@SiO2 > single Ni@SiO2 > Ni/SiO2. Moreover, the dual-layered core-shell catalyst revealed superior long-term stability under the reaction condition with SV=100,000 h−1 for 100 h time-on-stream. The catalysts were also characterized by H2-TPR, NH3-TPD, XPS, and TEM to analyze the activity trend and the catalytic stability. |
