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In this work, the production of renewable hydrocarbons was explored by the means of waste cottonseed oil (WCSO) micropyrolysis at 500 °C. Catalytic upgrading of the pyrolysis vapors was studied using α-AlO, γ-AlO Mo-Co/γ-AlO, and Mo-Ni/γ-AlO catalysts. The oxygen removal efficiency was much lower in non-catalytic pyrolysis (18.0%), whilst γ-AlO yielded a very high oxygen removal efficiency (91.8%), similar to that obtained with Mo-Co/γ-AlO (92.8%) and higher than that attained with Mo-Ni/γ-AlO (82.0%). Higher conversion yields into total renewable hydrocarbons were obtained with Mo-Co/γ-AlO (61.9 wt.%) in comparison to Mo-Ni/γ-AlO (46.6%). GC/MS analyses showed a relative chemical composition of 31.3, 86.4, and 92.6% of total renewable hydrocarbons and 58.7, 7.2, and 4.2% of oxygenated compounds for non-catalytic bio-oil (BOWCSO), BOMoNi and BOMoCo, respectively. The renewable hydrocarbons that were derived from BOMoNi and BOMoCo were mainly composed by olefins (35.3 and 33.4%), aromatics (31.4 and 28.9%), and paraffins (13.8 and 25.7%). The results revealed the catalysts' effectiveness in FFA decarbonylation and decarboxylation, as evidenced by significant changes in the van Krevelen space, with the lowest O/C ratio values for BOMoCo and BOMoNi (O/C = 0-0.10) in relation to the BOWCSO (O/C = 0.10-0.20), and by a decrease in the presence of oxygenated compounds in the catalytic bio-oils.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8306218 | PMC |
| http://dx.doi.org/10.3390/nano11071659 | DOI Listing |
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