Catalytic fast pyrolysis of biomass impregnated with K₃PO₄ to produce phenolic compounds: Analytical Py-GC/MS study
2013
Lu, Qiang | Zhang, Zhi-bo | Yang, Xiao-chu | Dong, Chang-qing | Zhu, Xi-feng
A new technique was proposed to produce phenolic-rich bio-oil from catalytic fast pyrolysis of biomass impregnated with K₃PO₄. In this study, analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were performed to investigate the K₃PO₄-catalyzed biomass pyrolysis process, mainly using poplar wood as the feedstock. The results indicated that the presence of K₃PO₄ would inhibit the devolatilization of holocellulose to form organic volatile compounds, and meanwhile promote the decomposition of lignin to form phenolic compounds (mainly the phenol and 2,6-dimethoxy phenol from poplar wood). With the increasing of the K₃PO₄ content, the yield of the total phenolic compounds was firstly increased and then decreased, while their total content was increased steadily. The maximal phenolics yield was obtained at around 7.42wt% K₃PO₄, with the peak area% of 42.8%. Whereas the maximal phenolics peak area% was over 60% at high K₃PO₄ content.
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