Bio-oil upgrading with catalytic pyrolysis of biomass using Copper/zeolite-Nickel/zeolite and Copper-Nickel/zeolite catalysts

Kumar, Ravinder, Strezov, Vladimir, Lovell, Emma, Kan, Tao, Weldekidan, Haftom, He, Jing, Dastjerdi, Behnam, and Scott, Jason (2019) Bio-oil upgrading with catalytic pyrolysis of biomass using Copper/zeolite-Nickel/zeolite and Copper-Nickel/zeolite catalysts. Bioresource Technology, 279. pp. 404-409.

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Abstract

The bio-oil obtained from a general pyrolysis process contains a higher concentration of oxygenated compounds and the resultant physical and chemical properties make it an unsuitable drop-in fuel. The oxygenated compounds in the bio-oil can be converted into hydrocarbons or less oxygenated compounds with the application of catalysts. This study demonstrated the bio-oil upgrading with the application of catalysts, comparing the catalytic effect of combined mono-metallic catalysts (Cu/zeolite and Ni/zeolite) and sole bi-metallic catalyst (CuNi/zeolite) on the composition of bio-oil and pyrolytic gases. The results demonstrated that in comparison to the combined mono-metallic catalysts, the sole bi-metallic catalyst showed better deoxygenation for all the oxygenated compounds and favoured the production of aliphatic hydrocarbons, whereas the combination of mono-metallic catalysts generated higher proportion of aromatic hydrocarbons in the bio-oil. In both cases, the catalysts equally favoured decarboxylation and decarbonylation reactions, as CO2/CO of approximately 1 was obtained during the pyrolysis process.

Research Statement

Research Background Catalytic fast pyrolysis (CFP) is considered a significant approach to convert the oxygenated compounds into a variety of hydrocarbons and improving the bio-oil quality. The introduction of a catalyst generally decreases the temperature of the pyrolysis process and removes the oxygen via various reactions, such as dehydration (removing oxygen as H2O), decarboxylation (removing oxygen as CO2), and decarbonylation (removing oxygen as CO). A plethora of studies has successfully demonstrated the application of different types of catalysts to upgrade pyrolytic oil. However, zeolites, such as ZSM-5 or H-ZSM-5 based catalysts have shown enhanced conversion of oxygenated compounds into hydrocarbons as compared to other catalysts, which is generally attributed to their acidic and porous characteristics.
Research Contribution The results of this study demonstrated that in comparison to the combined mono-metallic catalysts, the sole bi-metallic catalyst showed better deoxygenation for all the oxygenated compounds and favoured the production of aliphatic hydrocarbons, whereas the combination of monometallic catalysts generated higher proportion of aromatic hydrocarbons in the bio-oil. In both cases, the catalysts equally favoured decarboxylation and decarbonylation reactions, as CO2/CO of approximately 1 was obtained during the pyrolysis process.
Research Significance This study suggests that the application of sole bi-metallic catalyst in the biomass pyrolysis process would significantly reduce the requirement for hydrothermal upgrading of the bio-oils to produce drop-in fuels.
Item ID: 69445
Item Type: Article (Research - C1)
ISSN: 1873-2976
Keywords: Catalytic fast pyrolysis; Bio-oil upgrading; Combined mono-metallic; Bi-metallic; Hydrocarbons
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Copyright Information: © 2019 Elsevier Ltd. All rights reserved.
Research Data: https://www.sciencedirect.com/science/article/abs/pii/S0960852419300872
Date Deposited: 28 Sep 2021 23:45
FoR Codes: 40 ENGINEERING > 4004 Chemical engineering > 400402 Chemical and thermal processes in energy and combustion @ 70%
40 ENGINEERING > 4016 Materials engineering > 401607 Metals and alloy materials @ 30%
SEO Codes: 17 ENERGY > 1708 Renewable energy > 170801 Biofuel energy @ 100%
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