Advances in CO2 conversion to ethanol and higher alcohols
Researchers Andrii Kostyniuk and Blaž Likozar have published a comprehensive review on catalyst design and reaction mechanisms for the thermocatalytic conversion of CO2 into ethanol and higher alcohols (HA). The publication highlights key challenges, such as selectivity and stability, and presents the latest approaches to addressing these issues. This contribution offers significant insights into sustainable solutions for utilizing CO2, with great potential for industrial applications and environmental problem-solving.
The conversion of CO2 into valuable chemicals, such as ethanol and higher alcohols, represents a scientific and technological challenge due to the chemical inertness of CO2 and the complexity of reaction pathways. Kostyniuk and Likozar's work analyzes the latest developments in this field, focusing on thermocatalytic reactions in batch and continuous fixed-bed reactors.
A key focus of the review is on catalysts that overcome the limitations of traditional systems. The researchers highlighted three main families of catalysts: modified Cu-, Co-, and Fe-based catalysts, along with noble metal catalysts. For batch reactors, they explored the effects of various promoters, supports, and solvents on product selectivity. In continuous fixed-bed reactors, they analyzed the most active catalysts, including improvements that enable sustainable performance while minimizing deactivation.
Additionally, the researchers examined reaction mechanisms for ethanol and HA synthesis in detail, including CO-mediated pathways, formate/methoxy-mediated pathways, and carbon-carbon coupling (C–C coupling) reactions. This analysis provides a deeper understanding and optimization of processes.
The work also underscores the importance of catalysts in overcoming the kinetic limitations of reactions and their critical role in enhancing the selectivity of desired products. The researchers focused on practical applications that could facilitate the transition to industrial solutions with higher technology readiness levels.
The work of Kostyniuk and Likozar makes a significant contribution to understanding CO2 conversion into ethanol and higher alcohols, providing guidelines for future research in this field. The authors propose further development of catalysts to improve process selectivity and stability while emphasizing the need for industrial pilot projects to achieve sustainable chemical processes. This review paves the way for new opportunities in converting CO2 into high-value chemicals and a more sustainable future.
More information: doi.org/10.1016/j.cej.2024.158467
Contact: andrii.kostyniuk(at)ki.si