CO2 Reforming with Ethanol for Syngas Production over SiO2-M@CeO2 Catalysts (M: Cu,Ni): Impact of Active Metal

Graphical CO 2 Reforming : Transition metal-based SiO 2 -Ni@CeO 2 catalyst with typical core@shell structure exhibited the better activity/stability in CO 2 reforming with ethanol reaction compared to SiO 2 -Cu@CeO 2 sample. It is of great significance to design the high-performance catalysts with good anti-sintering and coke-resistance properties which can efficiently convert undesirable greenhouse gas CO 2 with bio-ethanol into high value-added syngas. To be addressed this issue, a series of SiO 2 -M@CeO 2 (M: Cu, Ni) catalysts with typical core@shell structure were prepared via a strong electrostatic adsorption technique. Interestingly, Ni-based catalyst exhibited the higher activity towards ethanol dry reforming at the relatively low temperature. Meanwhile, SiO 2 -Ni@CeO 2 catalyst presented good stability after a 50 h tests while a serious deactivation occurred for SiO 2 -Cu@CeO 2 within 20 h reaction due to heavy carbon deposition and reactor blockage. Herein, the higher catalytic performance of SiO 2 -Ni@CeO 2 catalyst compared to SiO 2 -Cu@CeO 2 sample was attributed to the combination effect of its mesoporous structure, higher Ni dispersion as well as stronger Ni-Ce interaction as depicted by BET, TEM, XPS, H 2 -TPR and XRD findings. This work might provide meaningful information to other reforming processes involving coke formation and active metal sintering problems.