Study On Reaction Mechanism Of Hydrogen Production Via Catalytic Steam Reforming Of Bio-oil Model Compounds

The composition of fast pyrolysis bio-oil (bio-oil for short) is extremely complicated,which can be summarized into six categories:acids, alcohols, ketones, aldehydes, phenols, and sugar, of which the highest content of acetic acid. In this paper, acetic acid, glycol, butanone, furfural, m-cresol and glucose are selected as model compounds to study the effect of S/C, LHSV and temperature with catalyst Ni/MgO on steam reforming of bio-oil. The results indicated that high S/C, the high temperature and low space velocity favored the improvement of H2 yield, desirable gas product purity and carbon selectivity in gas product.Most researchers focused on the process conditions, catalyst improvements, carbon deposition, while with less attention on the reaction mechanism of catalytic steam reforming of bio-oil. In this paper, a small amount of reaction intermediates in the condensate under the reaction conditions(T=600℃, LHSV=5h-1,S/C=6/1) were analyzed by GC/MS, to deduce that the possible catalytic reaction paths.Much of acetic acid was contained in bio-oil,thus its catalytic reforming behavior in catalysts Ni/AlO3,Al2O3 and Ni was studied, and BET and SEM characterization of the catalyst, inferred the causes leading to lower catalyst activity...