The utilization of renewable energy sources in the pyrolysis process for bio-oil production has garnered renewed attention. Solar pyrolysis presents a promising avenue for harnessing solar energy, transforming biomass energy into a portable and storable fuel. However, the formation of undesirable components necessitates upgrading bio-oil before it can be effectively employed as a fuel. In this study, ex-situ catalytic solar pyrolysis of microalgae is conducted, employing Mg-Al hydrotalcite precursor and zeolite as catalysts. The impact of different catalyst ratios on Schizochytrium limacinum pyrolysis properties, product yields, and characteristics was investigated under solar radiation. The bio-oil produced in the solar pyrolysis presented highly desirable compounds as long-chain hydrocarbons (aliphatic and aromatic). The formation of these hydrocarbons was more favored at the highest reaction temperature of 750 °C, at a ratio of NiHTC/(NiHTC + NiHZSM-5] of 0.50 and under a ratio of catalysts/biomass of 4:1, a condition that also led to an aromatization of approximately 80 % of the hydrocarbons. Just as hydrocarbon production was benefited under these conditions, which also led to an energy recovery efficiency (ERS) of approximately 65 %. These data represent 3357 g CO2 eq/GJ for the bio-oil of the present study compared to the 70331 g CO2 eq/GJ generated by fossil fuel usage, which can assist in reducing fuels' carbon footprint.

中文翻译：

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利用双催化剂床和太阳光作为加热源，通过热解裂殖壶菌微藻来提高生物油中的能量密度


在热解过程中利用可再生能源生产生物油已重新引起关注。太阳能热解为利用太阳能提供了一种很有前途的途径，将生物质能转化为便携式和可储存的燃料。然而，不良成分的形成需要升级生物油，然后才能有效地用作燃料。在本研究中，采用 Mg-Al 水滑石前驱体和沸石作为催化剂，对微藻进行非原位催化太阳能热解。在太阳辐射下研究了不同催化剂比例对裂殖壶菌热解性能、产物收率和特性的影响。太阳能热解产生的生物油呈长链碳氢化合物（脂肪族和芳香族）等非常理想的化合物。在 750 °C 的最高反应温度下，NiHTC/（NiHTC + NiHZSM-5] 的比例为 0.50，催化剂/生物质的比例为 4：1）时，这些碳氢化合物的形成更有利，该条件也导致约 80% 的碳氢化合物芳构化。正如在这些条件下碳氢化合物生产受益一样，这也导致了大约 65% 的能源回收效率 （ERS）。这些数据表明，本研究生物油的二氧化碳当量/吉焦耳为3357克，而使用化石燃料产生的二氧化碳当量为70331克/吉焦耳，这有助于减少燃料的碳足迹。