Abstract
Mo-modified ZSM-5 catalysts were prepared and used to produce aromatic hydrocarbons during catalytic fast pyrolysis (CFP) of biomass. The composition and distribution of aromatics were investigated on pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS). The reaction factors, such as the Mo content, the reaction temperature and the catalyst/biomass mass ratio, were also optimized. It was found that the 10Mo/ZSM-5 catalyst displayed the best activity in improving the production of monocyclic aromatic hydrocarbons (MAHs) and decreasing the yield of polycyclic aromatic hydrocarbons (PAHs) at 600 °C and with a catalyst/biomass ratio of 10. Furthermore, according to catalyst characterization and the experiment results, the aromatics formation mechanism over Mo/ZSM-5 catalysts was also summarized and proposed.
Highlights
In recent years, fast pyrolysis of biomass has proved to be an effective method to produce liquid bio-oil [1,2,3,4,5,6]
There are no metal Mo oxides peak areas indicating the well distribution of Mo on ZSM-5 catalysts
The different Mo/ZSM-5 catalysts were prepared by the impregnation method
Summary
Fast pyrolysis of biomass has proved to be an effective method to produce liquid bio-oil [1,2,3,4,5,6]. Catalytic upgrading of the bio-oil was considered as a feasible technology to produce aromatics. Especially ZSM-5 zeolites, due to their unique structure and chemical properties, were extensively researched during catalytic fast pyrolysis (CFP) of biomass to aromatics [15,16,17,18,19,20]. Inaba et al reported that the H-ZSM-5 and H-Beta zeolites were effective in improving the formation of aromatic hydrocarbons in catalytic fast pyrolysis of woody biomass [16]
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