Abstract Catalytic deoxygenation (DO) of triglycerides-based feeds to diesel-like fuel was investigated over NiO-CaO/SiO2-Al2O3 and NiO/SiO2-Al2O3 catalysts using semi-batch reactor under partial vacuum and inert N2 flow. The results showed that the bi-functional catalyst exhibited the highest DO activity with product selectivity toward diesel-like fuel n-(C13–C20). The catalytic process appeared to inhibit the occurrence of side reactions via neutralization of the strong acid sites. On the other hand, DO reaction under inert N2 flow has improved the deoxygenated product, which demonstrate that N2 flow condition has effectively removed the decarboxylation/decarbonylation gasses (CO2/CO) from poisoning the catalyst active sites. The high concentration of strong basic-acid sites of the catalyst is the main reason for increased C C cleavage pathway, while milder acidic sites responsible for C O cleavage pathway. High degree of unsaturated fatty acid in the feedstock has affected adversely the DO of triglycerides by accelerating the catalyst deactivation. The N2 flow condition, degree of unsaturated fatty acid in the feedstocks, acidity and basicity of the catalysts are important factors to improve DO activity as well as product selectivity.

中文翻译：

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在 SiO 2 -Al 2 O 3 负载的 NiO-CaO 催化剂上将甘油三酯模型化合物和非食用油热解-脱氧为碳氢化合物

摘要 在部分真空和惰性 N2 流下，使用半间歇式反应器，在 NiO-CaO/SiO2-Al2O3 和 NiO/SiO2-Al2O3 催化剂上研究了基于甘油三酯的进料对柴油样燃料的催化脱氧 (DO)。结果表明，双功能催化剂表现出最高的 DO 活性和对类柴油燃料 n-(C13-C20) 的产物选择性。催化过程似乎通过中和强酸位来抑制副反应的发生。另一方面，在惰性 N2 流下的 DO 反应改善了脱氧产物，这表明 N2 流条件有效地去除了使催化剂活性位点中毒的脱羧/脱羰气体 (CO2/CO)。催化剂的高浓度强碱性酸位点是增加 CC 裂解途径的主要原因，而较温和的酸性位点负责 CO 裂解途径。原料中的高度不饱和脂肪酸通过加速催化剂失活对甘油三酯的 DO 产生不利影响。N2 流动条件、原料中不饱和脂肪酸的程度、催化剂的酸碱度是提高 DO 活性和产品选择性的重要因素。