Konferensartikel

The catalytic cracking characteristics of a bio-oil molecular distillation fraction using HZSM-5 were investigated. Properties of upgraded products and formation mechanism for gasoline components were discussed. The cracking products included 56.00wt.% upgraded liquid oil; 1.27wt.% coke and 42.73wt.% gas products. The conversion yield for components in bio-oil fraction was influenced by their cracking reactivity and their concentration. The cracking reactivity of phenols was strongly affected by the connected functional groups. Alkyl groups had a positive influence on phenols reactivity; while methoxy groups had a negative influence. Reactivity of typical phenols in bio-oil fraction followed the order: Phenol; 4-methyl-> Phenol; 4-ethyl-2-methoxy->Phenol> Phenol; 2-methoxy-. Expected gasoline components including ethylbenzene; p-xylene and benzene; 1-ethyl-3-methyl were detected in the upgraded liquid oil; which indicates liquid hydrocarbon fuels can be produced from bio-oil. A two-step reaction mechanism was proposed which successfully explains the formation routes for gasoline components. In the first step; dehydration and decarbonylation reactions generate H₂O; CO and CO₂. The cracking reaction produces free radicals including -CH₃; -CH₂- and -H. In the second step; these free radicals form gaseous and liquid hydrocarbons.

Bio-oil; Molecular Distillation Technology; Cracking; HZSM-5; Gasoline Components

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