Bio-oil stability through stepwise pyrolysis of groundnut shells: Role of chemical composition, alkali and alkaline earth metals, and storage conditions

Bhatnagar, Anubhuti; Barthen, Robert; Tolvanen, Henrik; Konttinen, Jukka

doi:10.1016/j.jaap.2021.105219

Cited by 15 publications

(2 citation statements)

References 35 publications

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“…Bio‐oil is organic dark brown liquids which includes of various oxygenated compounds [24–26] . The presence of oxygenated functional groups increases the tendency of bio‐oil to perform secondary reactions, which ultimately reduces the bio‐oil stability [27,28] . Due to undesirable properties of bio‐oils such as their low heating value and high viscosity, the bio‐oil upgrading is inevitable [29–31] .…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26] The presence of oxygenated functional groups increases the tendency of bio-oil to perform secondary reactions, which ultimately reduces the bio-oil stability. [27,28] Due to undesirable properties of bio-oils such as their low heating value and high viscosity, the bio-oil upgrading is inevitable. [29][30][31] The two main processes of bio-oil upgrading are catalytic pyrolysis and hydrodeoxygenation.…”

Section: Introductionmentioning

confidence: 99%

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Valuable Biofuel Production via Pyrolysis Process of Olive Pomace over Alkali and Transition Metal Oxides Catalysts Supported on Activated Biochar

2022

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Non-catalytic and catalytic pyrolysis of olive pomace as the second generation of biomass has been investigated for the production of valuable biofuels. Bio-oil from the pyrolysis of olive pomace has high amounts of oxygenated compounds, therefore in this study, NiO, CoO, MgO and CaO catalysts supported on the activated biochar were used to upgrade the bio-oil via the deoxygenation process. The results indicated that the maximum bio-oil production yield through noncatalytic process was 56 wt. % at a temperature of 500 °C, which mainly includes oxygenated compounds with content more than 90 wt. %. Production of hydrocarbons, ketones and aldehydes through catalytic pyrolysis process of olive pomace over alkali metal oxides catalysts confirm occurrence of the decarboxylation, decarbonylation, ketonization and aldol condensation reactions. MgO/biochar and CaO/biochar catalysts represented similar performance in the conversion of fatty acids, but the CaO/biochar deoxygenation performance was better than MgO/biochar catalyst. Catalytic pyrolysis investigations indicated that transition metal oxides (NiO and Co 3 O 4 / biochar) catalysts represent higher deoxygenation activity than alkali metal oxides catalysts.

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Section: Introductionmentioning

confidence: 99%