Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2023-09-29 , DOI: 10.1016/j.cej.2023.146357
Min Lin , Yuhao Yan , Daxin Jiang , Xiaoxian Li , Rui Li , Yulong Wu
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In recent years, upgrading renewable bio–oil to hydrocarbon fuels has received increasing attention. It is crucial to develop a catalyst with high activity, low cost, and high hydrothermal stability for bio–oil upgrading. In this work, the non-noble metal Ni/CeO2 is proved to be a potential catalyst for hydrothermal hydrogenation of palmitic acid (model compound of microalgae based bio–oil). The effect of the crystal structure of the support on the hydrothermal hydrogenation activity of palmitic acid is investigated for the first time. The research results indicate that the catalytic activity of catalysts with different support crystal structures is in the following order: Ni/CeO2–r (nanorods) > Ni/CeO2–c (nanocubes) > Ni/CeO2–p (nanoparticles). The excellent activity of Ni/CeO2–r is attributed to its larger specific surface area, higher defect and oxygen vacancy concentration, and the formation of more Ni0 due to strong metal − support interaction (SMSI). After optimization of conditions at 300 °C, 98.9 % conversion and 92.4 % alkanes yield are obtained over the Ni/CeO2–r. In addition, the coating structure formed by the SMSI provides good hydrothermal stability for the catalyst.
中文翻译:
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深入探讨 CeO2 晶体结构对 Ni/CeO2 催化剂上棕榈酸水热加氢的影响
近年来,将可再生生物油升级为碳氢燃料越来越受到关注。开发一种高活性、低成本、高水热稳定性的催化剂对于生物油提质至关重要。在这项工作中,非贵金属Ni/CeO 2被证明是棕榈酸(微藻基生物油的模型化合物)水热加氢的潜在催化剂。首次研究了载体晶体结构对棕榈酸水热加氢活性的影响。研究结果表明,不同载体晶体结构的催化剂的催化活性依次为:Ni/CeO 2 –r(纳米棒)> Ni/CeO 2 –c(纳米立方体)> Ni/CeO 2–p(纳米粒子)。Ni/CeO 2 –r的优异活性归因于其较大的比表面积、较高的缺陷和氧空位浓度,以及由于强金属-载体相互作用(SMSI)而形成更多的Ni 0 。在 300 °C 条件优化后,Ni/CeO 2 –r 的转化率达到 98.9%,烷烃产率达到 92.4%。此外,SMSI形成的涂层结构为催化剂提供了良好的水热稳定性。