Abstract
In this research, mesoporous alumina synthesized from sol-gel self-assembly (EISA) procedure has been used as an efficient supporting material for bimetallic Ni-Co active sites to be applied in the steam reforming of methane (SRM) reaction for the first time. For this purpose, after confirming the formation of porous alumina structure via N2 adsorption/desorption, transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and field emission scanning electron microscopy (FESEM), and fourier-transform infrared spectroscopy (FT-IR) techniques, we have loaded this support with various Ni/Co mass ratios (0/1, 1/2, 1/1/, 2/1/, 1/0), characterized their structural properties with various techniques, and tested their performance in the SRM process. Overall, presence of Co particles depicted efficient performance in not only catalyst morphology, but also in reaction activity. Among bimetallic synthesized catalysts, 10Ni-10Co exhibited the highest CH4 conversion of 95.7 % and H2 yield of 96.2 % with the lowest carbon deposition of 3.6 wt%, owing to improved active site dispersion and higher BET surface area. After loading this catalyst with cerium, promotion effect of only 1 wt% CeO2 particles caused the best performance with an average CH4 conversion of 97.0 %, H2 yield of 98.8 %, H2/CO molar ratio of 4.0, and CO2/CH4 molar ratio of 0.3 at 700 °C.
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