Identification of the underlying cause of carbon loss in fatty acid hydrodeoxygenation (HDO) on the acidic catalyst is very important to understand the reaction mechanism and design high efficiency catalyst for biomass conversion. Herein, HDO reactions of palmitic acid catalyzed by Ni supported on mesoporous Beta (HBeta-M) zeolites with different acidities were investigated. It was found that a significant carbon loss (47.5%) occurred during the entire reaction process on Ni/HBeta-M catalyst with high acid density. This is because the hexadecyl ether intermediate was formed and trapped in the porous structure of the catalyst and interacted with strong acidic sites. On the Ni/HBeta-M-0.5 catalyst with medium acid density, carbon loss occurred in the initial reaction stage because hexadecanol was trapped in the porous catalyst. Investigations further demonstrated that the hexadecyl ether intermediate can also be converted to hexadecanol and hexadecane via hydrogenolysis on Brønsted acid and Ni sites.

中文翻译：

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深入探讨 Ni@Hβ 催化剂上脂肪酸加氢脱氧碳损失的根本原因和相关化学过程

确定酸性催化剂上脂肪酸加氢脱氧（HDO）碳损失的根本原因对于理解反应机理和设计生物质转化的高效催化剂非常重要。在此，研究了不同酸度介孔β（Hβ-M）沸石负载的Ni催化棕榈酸的HDO反应。结果发现，在高酸密度的Ni/Hβ-M催化剂上，整个反应过程中发生了显着的碳损失（47.5%）。这是因为十六烷基醚中间体形成并被捕获在催化剂的多孔结构中并与强酸性位点相互作用。在中等酸密度的Ni/Hβ-M-0.5催化剂上，由于十六醇被困在多孔催化剂中，因此在反应初始阶段发生碳损失。研究进一步表明，十六烷基醚中间体也可以通过布朗斯台德酸和镍位点的氢解作用转化为十六醇和十六烷。