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Analysis of Bio‐Oil Derived from Catalytic Pyrolysis of Pine Sawdust over Sodium Salts‐Supported γ‐Al 2 O 3
Author(s) -
Xue Xiangfei,
Pan Zeyou,
Zhang Changsen,
Wang Dengtai,
Xie Yunyun,
Zhang Ruiqin
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13174
Subject(s) - catalysis , sawdust , pyrolysis , heat of combustion , pyrolysis oil , yield (engineering) , chemistry , sodium , acid value , chemical composition , nuclear chemistry , chemical engineering , organic chemistry , materials science , metallurgy , biochemistry , engineering , combustion
Catalytic pyrolysis of pine sawdust with five sodium salts‐supported γ‐Al 2 O 3 was performed in a fixed‐bed reactor at 500°C for liquid products. The liquid products were analyzed for its physics and chemical properties, such as product yield, oil phase proportion and yield, water content, chemical composition, elemental analysis, and calorific value. The results indicate that liquid yields decreased with the five catalysts compared with non‐catalytic pyrolysis, whereas phase separation (oil and aqueous phases) was observed. The oil phase water content drops sharply to around 10% compared to non‐catalytic bio‐oil (30%). The acid was not observed in the chemical composition of the oil phase product when the catalysts were present. The oxygen content of the oil phase products was significantly reduced. Of the five catalysts, Na 2 SiO 3 /γ‐Al 2 O 3 catalyst showed better catalytic performance for its maximum oil phase product yield and oil quality. High heat value of the five oil phase products was all above 30.0 MJ/kg with this catalytic system. The new sodium ion species generated from the combination of sodium salts and γ‐Al 2 O 3 , which may be responsible to the improvement of bio‐oil quality. Furthermore, the excess sodium salts on the γ‐Al 2 O 3 surface play an important role on the fast pyrolysis of pine sawdust. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019