Tuning Ionic Liquid-Based Catalysts for CO₂ Conversion into Quinazoline-2,4(1H,3H)-diones.

Area of Science:

• Green Chemistry
• Catalysis
• Materials Science

Background:

• Atmospheric CO2 concentration increases due to fossil fuel combustion, driving climate change.
• Carbon capture and utilization (CCU) offers strategies to mitigate CO2 emissions.
• Ionic liquids (ILs) possess unique properties making them suitable for CO2 capture and conversion.

Purpose of the Study:

• To critically review IL-based catalysts for CO2 conversion into quinazoline-2,4(1H,3H)-diones.
• To analyze catalytic mechanisms including amino preferential activation, CO2 preferential activation, and simultaneous activation.
• To provide an overview of advancements in IL-based catalysis for CO2 utilization from 2012-2022.

Main Methods:

• Systematic investigation of ILs with basic anions (e.g., [OH], carboxylates, aprotic heterocyclic anions).
• Analysis of catalytic activity and selectivity for CO2 and o-aminobenzonitriles conversion.
• Review of literature focusing on IL-based catalysts developed between 2012 and 2022.

Main Results:

• ILs with basic anions effectively catalyze the synthesis of quinazoline-2,4(1H,3H)-diones.
• Different catalytic mechanisms influence reaction outcomes.
• Tunable IL structures allow for optimized catalytic performance.

Conclusions:

• IL-based catalysts are promising for efficient CO2 conversion into high-value chemicals.
• Further development of ILs can lead to novel catalysts for other acid gases like SO2 and H2S.
• This review provides a comprehensive understanding for researchers in the field of CO2 utilization.