Catalytic pyrolysis of corncob with Ni/CaO catalysts for hydrogen-rich gas: Synthesis modes and catalyst/biomass ratios

다국어 초록 (Multilingual Abstract)

With the depletion of traditional fossil fuels, biomass has evolved as a new environmentally friendly andsustainable alternative energy source. Ni/CaO catalysts are promising for CO2 capture and biomass catalyticuse. In this study, we examined four different synthesis modes for Ni/CaO catalysts: impregnationmethod, sol–gel method (citric acid complexation), sol–gel method with propionic acid modification andsedimentation method, and used the catalysts in the pyrolysis of corncob to produce hydrogen-rich gas at600 C. According to the results of the fixed-bed experiments, adding the propionic acid modification tothe citric acid complexation boosted hydrogen generation by 24.93 vol.%. The global behavior of the catalystssynthesized by the different methods follows the order sol-Ni1/Ca7-P > sol-Ni1/Ca7 > sed-Ni1/Ca7imp-Ni1/Ca7-A. At a catalyst/biomass ratio of 2:1, the maximum H2 concentration of 84.45 ± 1.02vol.% and H2 production of 26.84 ± 1.26 mmol/gbiomass were attained, as well as CO2 concentrations of just2.08 ± 0.03 vol.%. The H2 production was about 20 times higher than without the addition of the catalyst.
Optimizing the synthesis modes and catalyst/biomass ratio produced high-quality hydrogen-rich gaswith a high H2 conversion of 88.95 ± 2.20 % and the energy efficiency of 52.73 %.