Synthesis and Characterization of Iron-Based Catalysts for Carbon Dioxide Valorization

The extensive release of carbon dioxide (CO[sub.2]) into the atmosphere is associated with the detrimental impacts of the global environmental crisis. Consequently, the valorization of CO[sub.2] from industrial processes holds great significance. Transforming CO[sub.2] into high added-value products...

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Published in:Applied sciences 2024-06, Vol.14 (11), p.4959
Main Authors: Bakratsa, Alexandra, Zacharopoulou, Vasiliki, Karagiannakis, George, Zaspalis, Vasileios, Kastrinaki, Georgia
Format: Article
Language:English
Subjects:
Acids
Carbon dioxide
carbon dioxide valorization
Carbon sequestration
Catalysts
Emissions
Global warming
Greenhouse gases
heterogeneous catalysis
Hydrocarbons
Hydrogenation
iron-based materials
Metal oxides
Metals
Nanoparticles
Potassium
Zeolites
Zinc
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Summary:The extensive release of carbon dioxide (CO[sub.2]) into the atmosphere is associated with the detrimental impacts of the global environmental crisis. Consequently, the valorization of CO[sub.2] from industrial processes holds great significance. Transforming CO[sub.2] into high added-value products (e.g., CH[sub.4], C[sub.1]-C[sub.3] deoxygenated products) has attracted considerable attention. This is feasible through the reverse water–gas shift (RWGS) and Fischer–Tropsch synthesis (FTS) reactions; CO is initially formed and then hydrogenated, resulting in the production of hydrocarbons. Iron-based materials have a remarkable ability to catalyze both RWGS and FTS reactions, enhancing the olefinic nature of the resulting products. Within this context, iron-based nanoparticles, unsupported and supported on zeolite, were synthesized and physico-chemically evaluated, applying multiple techniques (e.g., BET, XRD, FT-IR, Raman, SEM/TEM, DLS, NH[sub.3]-TPD, CO[sub.2]-TPD). Preliminary experiments show the potential for the production of C[sub.2+] deoxygenated products. Among the tested samples, supported Fe[sub.3]O[sub.4] and Na-Fe[sub.3]O[sub.4] (A) nanoparticles on HZSM-5 are the most promising for promoting CO[sub.2] valorization into products with more than two carbon atoms. Results demonstrate that product distribution is highly affected by the presence of acid sites, as low-medium acid sites and medium acidity values enable the formation of C[sub.2+] hydrocarbons.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14114959