Alumina-based bifunctional catalyst for efficient CO₂ fixation into epoxides at atmospheric pressure

Mitra, Antarip and Ghosh, Sourav and Paliwal, Khushboo S. and Ghosh, Suptish and Tudu, Gouri and Chandrasekar, Aditi and Mahalingam, Venkataramanan (2022) Alumina-based bifunctional catalyst for efficient CO₂ fixation into epoxides at atmospheric pressure. Inorganic Chemistry, 61 (41). pp. 16356-16369. ISSN 0020-1669

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Abstract

The quest toward sustainability and decarbonization demands the development of methods for efficient carbon dioxide capture and utilization. The nonreductive CO2 fixation into epoxides to prepare cyclic carbonates has gained attention in recent years. In this work, we report the development of guanidine hydrochloride-functionalized γ alumina (γ-Al2O3), prepared using green solvents, as an efficient bifunctional catalyst for CO2 fixation. The resulting guanidine-grafted γ-Al2O3 (Al–Gh) proved to be an excellent catalyst to prepare cyclic carbonates from epoxides and CO2 with high selectivity. The nitrogen-rich Al–Gh shows increased CO2 adsorption capacity compared to that of γ-Al2O3. The as-prepared catalyst was able to carry out CO2 fixation at 85 °C under atmospheric pressure in the absence of solvents and external additives (e.g., TBAI or KI). The material showed negligible loss of catalytic activity even after five cycles of catalysis. The catalyst successfully converted many epoxides into their respective cyclic carbonates under the optimized conditions. The gram-scale synthesis of commercially important styrene carbonates from styrene oxide and CO2 using Al–Gh was also achieved. Density functional theory (DFT) calculations revealed the role of alumina in activating the epoxide. This activation facilitated the chloride ion to open the ring to react with CO2. The DFT studies also validated the role of alumina in stabilizing the electron-rich intermediates during the course of the reaction.

Item Type:	Article
Authors:	Mitra, Antarip and Ghosh, Sourav and Paliwal, Khushboo S. and Ghosh, Suptish and Tudu, Gouri and Chandrasekar, Aditi and Mahalingam, Venkataramanan
Document Language:	Language English
Subjects:	Natural Sciences Natural Sciences > Chemistry & allied sciences
Divisions:	Azim Premji University - Bengaluru > School of Arts and Sciences
Full Text Status:	None
URI:	http://publications.azimpremjiuniversity.edu.in/id/eprint/7077
Publisher URL:	https://doi.org/10.1021/acs.inorgchem.2c02363

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