Abstract In this research, a one-pot production of biodiesel, hydrocarbons, oxygenates, and aromatics form Chlorella vulgaris was performed in supercritical methanol without catalyst and in the presence of TiO2 and SrTiO3 nanocatalysts. The reaction in the presence of SrTiO3 showed the highest production yield of fatty acid methyl esters (FAMEs). The co-solvents water, chloroform, diethyl ether, and n-hexane were used for modifying the supercritical medium to affect the product yields in SrTiO3-catalyzed process. The SrTiO3 nanocatalyst was photochemically prepared and the leaching of catalysts into the products was evaluated. Results showed that for all products except oxygenates, the addition of diethyl ether and chloroform to methanol had a slightly positive effect on the production yields. For all products, n-hexane co-solvent showed the best performance with production yields of 16.65, 2.42, 2.12, and 0.57 mg.g−1biomass for FAMEs, oxygenates, hydrocarbons, and aromatics, respectively. Furthermore, the water showed no significant effect on production yields except in the case of oxygenates. The results may be due to the high ability of n-hexane for dissolving the biomass in the reaction condition. Also, the ICP-OES detected no trace amounts of catalyst in the final product and it confirms that the photochemical method for catalyst preparation can prevent the catalyst leaching.

中文翻译：

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使用光化学合成 SrTiO3 纳米催化剂从普通小球藻生产一锅生物柴油的改良超临界介质

摘要 在本研究中，在无催化剂的超临界甲醇中，在 TiO2 和 SrTiO3 纳米催化剂存在下，从普通小球藻中一锅法生产生物柴油、碳氢化合物、含氧化合物和芳烃。在 SrTiO3 存在下的反应显示出脂肪酸甲酯 (FAME) 的最高产率。共溶剂水、氯仿、乙醚和正己烷用于改性超临界介质以影响 SrTiO3 催化过程中的产物产率。光化学制备了 SrTiO3 纳米催化剂，并评估了催化剂浸出到产品中的情况。结果表明，对于除含氧化合物外的所有产品，向甲醇中加入乙醚和氯仿对产率有轻微的积极影响。对于所有产品，正己烷共溶剂表现出最佳性能，FAME、含氧化合物、烃类和芳烃的产量分别为 16.65、2.42、2.12 和 0.57 mg.g-1 生物质。此外，除含氧化合物外，水对产量没有显着影响。结果可能是由于正己烷在反应条件下溶解生物质的高能力。此外，ICP-OES 在最终产品中未检测到痕量催化剂，这证实了催化剂制备的光化学方法可以防止催化剂浸出。结果可能是由于正己烷在反应条件下溶解生物质的高能力。此外，ICP-OES 在最终产品中未检测到痕量催化剂，这证实了催化剂制备的光化学方法可以防止催化剂浸出。结果可能是由于正己烷在反应条件下溶解生物质的高能力。此外，ICP-OES 在最终产品中未检测到痕量催化剂，这证实了催化剂制备的光化学方法可以防止催化剂浸出。