Abstract The catalytic deoxygenation of biomass to produce renewable carbon energy addresses major concerns of limited energy sources. In particular, the second-generation biodiesel by selective deoxygenation possesses a higher cetane number, lower cloud point, and higher oxidation stability compared to the fatty acid ester-based biodiesel, and therefore, can be fed directly to the current diesel engines. In present work, we address the significant concerns of cost-effectiveness, high hydrodeoxygenation (HDO) selectivity, modest hydrogen environments, and solvent-free condition using high surface area silica-alumina-supported cobalt oxide nanoparticles as a catalyst to produce fuel-grade hydrocarbons from fatty acid-based feeds that are palm oil and jatropha oil. The catalytic performance is tested for methyl stearate to achieve the best conversion efficiency with remarkable deoxygenation selectivity. The HDO selectivity was as high as 87% at 250 °C and 30 bar H2 pressure, whereas moderate HDO selectivity with relatively higher cracking was observed at 300 °C and 2 bar H2 pressure. Remarkably, the HDO selectivity was comparable in the absence of solvent. The catalyst is recyclable with low metal leaching during the deoxygenation. The use of non-noble metal catalysts under solvent-free conditions offers facile production of fuel-grade hydrocarbons.

中文翻译：

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用于甘油三酯原料脱氧的高选择性 Co3O4/二氧化硅-氧化铝催化体系

摘要 生物质催化脱氧以生产可再生碳能源解决了能源有限的主要问题。特别是，与脂肪酸酯基生物柴油相比，选择性脱氧的第二代生物柴油具有更高的十六烷值、更低的浊点和更高的氧化稳定性，因此可以直接供入现有柴油发动机。在目前的工作中，我们解决了成本效益、高加氢脱氧 (HDO) 选择性、适度的氢环境和无溶剂条件等重大问题，使用高表面积二氧化硅 - 氧化铝负载的氧化钴纳米粒子作为催化剂来生产燃料级来自棕榈油和麻风树油等脂肪酸原料的碳氢化合物。对硬脂酸甲酯的催化性能进行了测试，以实现最佳的转化效率和显着的脱氧选择性。在 250 °C 和 30 bar H2 压力下，HDO 选择性高达 87%，而在 300 °C 和 2 bar H2 压力下，HDO 选择性适中，裂化率相对较高。值得注意的是，在没有溶剂的情况下，HDO 的选择性相当。该催化剂可回收利用，脱氧过程中金属浸出率低。在无溶剂条件下使用非贵金属催化剂可以轻松生产燃料级碳氢化合物。在没有溶剂的情况下，HDO 的选择性相当。该催化剂可回收利用，脱氧过程中金属浸出率低。在无溶剂条件下使用非贵金属催化剂可以轻松生产燃料级碳氢化合物。在没有溶剂的情况下，HDO 的选择性相当。该催化剂可回收利用，脱氧过程中金属浸出率低。在无溶剂条件下使用非贵金属催化剂可以轻松生产燃料级碳氢化合物。