A study of optimization of solar pyrolysis and catalyst recovery and reuse

[Display omitted] •Ex situ solar catalytic pyrolysis was studied using mixed oxides catalyst;•The effect of the parameters on the bio-oil yield and composition was investigated;•The yields of bio-oil and hydrocarbons were optimized and validated;•Regenerated catalysts presented a good performance on...

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Bibliographic Details
Published in:Energy conversion and management 2021-06, Vol.237, p.114094, Article 114094
Main Authors: Barbosa, J.M., Rossi, R.A.S., Andrade, L.A., Barrozo, M.A.S., Vieira, L.G.M.
Format: Article
Language:English
Subjects:
Aliphatic hydrocarbons
Aluminum
Aromatic compounds
Aromatic hydrocarbons
Catalysis
Catalysts
Energy sources
Ex-situ
Hydrocarbons
Independent variables
Magnesium
Microalgae
Mixed oxides
Oil
Optimization
Pyrolysis
Pyrolysis products
Reaction time
Renewable energy
Renewable energy sources
Yield
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Summary:[Display omitted] •Ex situ solar catalytic pyrolysis was studied using mixed oxides catalyst;•The effect of the parameters on the bio-oil yield and composition was investigated;•The yields of bio-oil and hydrocarbons were optimized and validated;•Regenerated catalysts presented a good performance on the bio-oil upgrading. The use of renewable energy sources in the pyrolysis process for bio-oil production has gained a renewed interest. In this work, ex-situ catalytic solar pyrolysis (ECSP) of microalgae was performed using Mg-Al mixed oxides catalyst derived from hydrotalcite. The effects of biomass loading, reaction time, and catalyst percentage on the pyrolysis product were investigated. The condition that maximizes simultaneously the bio-oil yield and its hydrocarbon content was obtained in an optimization study. A study of the effect of catalyst reuse on the pyrolysis process was also performed. The results showed that high yields of bio-oil were found when intermediary values of independent variables were used. The use of the catalyst derived from hydrotalcite improved the quality of bio-oil, promoting a reduction of oxygenated compounds and forming aromatic and long-chain aliphatic hydrocarbons. High bio-oil yield (38.55%) with high hydrocarbon content (32.65%) was achieved under the optimal conditions. The study of the catalyst reuse showed that the structure and surface area of fresh and regenerated catalyst were very similar. In addition, the hydrocarbon content of bio-oil did not significantly change after three pyrolysis cycles.
ISSN:0196-8904
1879-2227
DOI:10.1016/j.enconman.2021.114094