Abstract
The kinetics of autothermal reforming of glycerol in a tubular fixed-bed reactor using a nickel-based catalyst supported over Ce0.5Zr0.33Gd0.16O2−δ has been investigated for the first time for hydrogen production. The study was conducted using steam-to-glycerol ratio (6, 9, 12), oxygen-to-glycerol ratios (0.2, 0.5, 0.8) and weight of catalyst/glycerol molar ratio (W/FG0) of 5.05, 6.55 and 8.06 kgcatalyst h kmol G −1 at atmospheric pressure and reaction temperature in the range (723–873 K). An integral analysis combined with a real-valued genetic algorithm optimizer was used to estimate rate model parameters. This analysis resulted in a power law rate model with an apparent activation energy of 53.3 kJ mol−1 and reaction orders 0.16, 0.74 and − 0.49 with respect to glycerol, oxygen and steam partial pressures. The model predicted conversions and the experimentally obtained conversions exhibited close resemblance with an average absolute deviation of 7%.
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