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International Journal of Renewable, Green, and Sustainable Energy

Open Access Peer Review International
Open Access

INFLUENCE OF CATALYSTS ON BIO-OIL PRODUCTION FROM CASTOR CAKE VIA HYDROTHERMAL LIQUEFACTION: YIELD AND COMPOSITIONAL ANALYSIS

DOI https://doi.org/10.55640/ijrgse-v02i04-01
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Keiko Yamashita 1 , Kenji Suzuki 1 ,
4 Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Tokyo, Japan
4 Renewable Energy Research Division, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan

Abstract

This study investigates the impact of various catalysts on bio-oil production from castor cake using the hydrothermal liquefaction (HTL) process. Castor cake, a non-edible agricultural residue, serves as a promising biomass feedstock for sustainable fuel generation. The experiments were conducted under subcritical water conditions, with different heterogeneous and homogeneous catalysts to evaluate their effects on bio-oil yield and composition. The presence of catalysts significantly influenced the deoxygenation and cracking reactions, leading to variations in the physicochemical properties of the resulting bio-oil. Catalysts such as Na₂CO₃ and ZnCl₂ demonstrated enhanced bio-oil yields and favorable hydrocarbon profiles. Gas chromatography–mass spectrometry (GC-MS) and elemental analysis revealed improved energy content and reduced oxygen content in catalyst-assisted runs. These findings highlight the critical role of catalytic selection in optimizing bio-oil quality and yield, supporting the advancement of sustainable biofuel production technologies.

Keywords

Castor cake, bio-oil, hydrothermal liquefaction

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