To enhance deoxygenation and cracking performance of microalgal biodiesel to produce a jet fuel-range hydrocarbon blend, an efficient Ni-carbon composite was prepared by pyrolyzing Ni-based metal–organic frameworks (Ni-1,3,5-benzenetricarboxylate, Ni-BTC) for catalytic conversion with a substantially reduced catalyst dosage. Coordinated Ni ions in the Ni-BTC precursor were converted into highly active Ni nanoparticles due to catalyst pyrolysis, while an increased specific surface area of the catalyst facilitated mass transfer in microalgal biodiesel conversion. X-ray absorption fine structure analysis confirmed the formation of Ni–Ni active sites, while density functional theory calculations revealed that the C═C bond was the initial site for the cracking reaction of long-chain fatty acids. The selectivity of jet-fuel-range products in methyl palmitate conversion over the Ni@C₅₀₀ (Ni-BTC pyrolyzed at 500 °C) catalyst increased to 71.46% with a substantially reduced catalyst dosage (the mass ratio of catalyst to reactant was 1:200). The Ni@C₅₀₀ catalyst exhibited excellent performance with high selectivity (71.6%) and conversion efficiency (97.46%) in deoxygenation and cracking of microalgal biodiesel for jet fuel-range hydrocarbon blend production.

中文翻译：

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具有高脱氧和裂解能力的改性镍基金属有机框架（Ni-BTC），用于在低催化剂用量下生产喷气燃料范围的碳氢化合物混合物


为了提高微藻生物柴油的脱氧和裂解性能以生产喷气燃料范围的碳氢化合物混合物，通过热解镍基金属有机骨架（Ni-1,3,5-苯三羧酸盐，Ni-BTC）制备了高效的镍碳复合材料）用于催化转化，并大幅减少催化剂用量。由于催化剂热解，Ni-BTC前体中的配位镍离子被转化为高活性的镍纳米粒子，而催化剂比表面积的增加促进了微藻生物柴油转化中的传质。 X射线吸收精细结构分析证实了Ni-Ni活性位点的形成，而密度泛函理论计算表明C=C键是长链脂肪酸裂解反应的起始位点。在 Ni@C ₅₀₀ （Ni-BTC 在 500 °C 热解）催化剂上，喷气燃料系列产品在棕榈酸甲酯转化中的选择性提高到 71.46%，同时大幅降低了催化剂用量（质量比）催化剂与反应物的比例为1:200)。 Ni@C ₅₀₀ 催化剂在用于生产喷气燃料系列碳氢化合物混合物的微藻生物柴油脱氧和裂解中表现出优异的性能，具有高选择性（71.6％）和转化效率（97.46％）。