Upgraded bio-oil production with catalytic co-pyrolysis of spruce sawdust

Authors : Ahmet Rasim Girişen, Hakan Özcan
Pages : 1335-1343
Doi:10.5505/pajes.2025.01679
View : 38 | Download : 142
Publication Date : 2025-12-15
Article Type : Research Paper
Abstract :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 bio-oil 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.
Keywords : Katalitik kopiroliz, Biyokütle, Gliserol, HZSM-5, Dolomit

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