Akademik Veri Yönetim Sistemi
PAMUKKALE UNIVERSITY JOURNAL OF ENGINEERING SCIENCES-PAMUKKALE UNIVERSITESI MUHENDISLIK BILIMLERI DERGISI, cilt.31, sa.7, ss.1335-1343, 2025 (ESCI, TRDizin)
This paper aimed to upgrade the bio-oils with the catalytic co-pyrolysis
of spruce sawdust. A bubble-fluidized bed pyrolysis reactor was used in
the experiments. The effects of the different mixing ratios of spruce
sawdust with glycerol (10, 20, and 30 wt%), the usage of different
catalysts (HZSM-5 and dolomite), and pyrolysis temperatures (400 °C,
450 °C, 500 °C, 550 °C and 600 °C) on the yields and quality of obtained
bio-oils were examined. The experimental results revealed that the biooil yield improved with an additive of glycerol at all mixing ratios. The
highest bio-oil yield (46.4 wt%) was received at a 20 wt% mixing ratio
of glycerol and a pyrolysis temperature of 550 °C with a dolomite
catalyst. The results of GC-MS indicated that the pyrolysis oil included a
high proportion of ketones, phenols, and alcohols, which supported the
potential of the catalytic co-pyrolysis of spruce sawdust with glycerol
for bio-oil upgrading. The pyrolysis oil from spruce sawdust pyrolysis
consisted of a ratio of 4.81% (GC-MS peak area) of unoxygenated
hydrocarbons. Furthermore, the unoxygenated components were found
to be 8.02% in the bio-oil produced by co-pyrolysis with glycerol. The
number of unoxygenated hydrocarbons increased significantly during
ex-situ catalytic co-pyrolysis. The unoxygenated hydrocarbons in the
bio-oils produced by catalytic co-pyrolysis with HZSM-5 and dolomite
were found to be 19.10% and 22.24%, respectively. The co-pyrolysis and
catalytic co-pyrolysis results also revealed that the average carbon
number of the compounds in the bio-oils depends on the chosen methods
and catalysts. Using the catalyst in the reactor resulted in the formation
of low-carbon number hydrocarbons. However, when used outside the
reactor, the catalysts were observed to be more effective for
deoxygenation