Abstract
Long-chain fatty acids were the main components of algal bio-oil, the acidity and corrosiveness posed great challenges to the direct utilization of algal bio-oil. Because of the high water content, the aqueous-phase catalytic upgrading of algal bio-oil was necessary. In this work, a series of coated non-noble metal porous carbon catalysts had been synthesized in a two-step process and applied to the aqueous-phase deoxygenation of palmitic acid. Co30@NC550achieved the highest C16alkanes yield of 45.13 % with 92.82 % conversion of palmitic acid at 250 °C. Characterization of the catalysts revealed that the Co nanoparticles were coated with porous carbons, giving it outstanding HDO selectivity. The catalyst showed fine hydrothermal stability, which could maintain high catalytic activity within five cycles. In addition, the reaction mechanism was performed. The reaction pathways were constructed based on the products and the active sites of each step were analyzed.
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