Pyrolysis of wood waste to enhance hydrogen production on iron-based aluminum dross

Abstract

Iron based on aluminum dross was prepared to enhance hydrogen production by impregnated method. The pyrolysis experiments are performed in a fix-bed reactor to obtain pyrolysis product distribution. The pyrolysis behavior of poplar on iron-based aluminum dross was studied by thermogravimetric analysis (TG), and hydrogen composition in pyrolysis gas were determined by gas chromatography (GC). The results show that iron-based aluminum dross has a significant effect on improving hydrogen generation. The iron-based aluminum dross with 6% iron on aluminum dross promotes hydrogen by 18.48% compared with poplar. The kinetic calculation shows that the activation energy increases by 20.53% at conversion rate of 0.8, indicating that iron-based aluminum dross increases the condensation reaction degree with the pyrolysis residue increasing and requires more external energy for bond dissociation at high-temperature stage. Hydrogen generation is dominated by contracting volume and diffusional theory controlled by Carbon-Oxygen-Metal (COM) active intermediate during pyrolysis on iron-based aluminum dross. Pyrolysis reactivity of poplar is improved during the reaction of A1-A4 nucleation and growth stage in low-temperature stage. The high-temperature stage follows the F3 and D3 models and the gas diffusion rate increases to enhance active intermediate generation for hydrogen production.