| 초록 |
From the thermodynamics of dry reforming of methane (DRM), a high temperature is necessary to attain a high conversion of CH4 and CO2. However, the high temperature causes sintering of the metal nanoparticles (NPs) the active sites. As a result, the surface area to volume ratio of the NPs decreases, leading to the rapid deactivation of the catalyst. Thus, the design of a highly stable catalyst for the DRM still a challenge. Herein, we successfully synthesized a highly stable CoNi/MgAl2O4 catalyst using one-pot evaporation induced self-assembly combined with exsolution method. We found that the reduction time highly influences on the exsolution of the active metals from the support (MgAl2O4), and hence on its catalytic activity towards the DRM. At reduction temperature of 800 °C and reduction time of 2.0 h, the in-situ XRD analysis showed that the active metals were fully exsoluted from the support. Consequently, the catalyst showed the best performance for DRM reaction with stable CO2 and CH4 conversions of 94% and 85%, respectively after operating the reaction for 100 h, at gas hourly space velocity of 36,000 h-1. |
