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Increasing energy density in bio-oil through pyrolysis of Schizochytrium limacinum microalgae using a dual-catalyst bed and sunlight as the heating source
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DOI：10.1016/j.biombioe.2024.107548.png)
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Abstract
En 中文
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 biooil 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 longchain hydrocarbons (aliphatic and aromatic). The formation of these hydrocarbons was more favored at the highest reaction temperature of 750 degrees 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.
Keywords:
Thermochemical process
Hydrotalcite precursor
Zeolite
Solar radiation
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