Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion
Neha Sharma, Bharat Ugale, Sunil Kumar, Kamalakannan Kailasam
Abstract
The capture and catalytic conversion of CO 2 into value-added chemicals is a promising and sustainable approach to tackle the global warming and energy crisis. The nitrogen-rich porous organic polymers are excellent materials for CO 2 capture and separation. Herein, we present a nitrogen-rich heptazine-based microporous polymer for the cycloaddition reaction of CO 2 with epoxides in the absence of metals and solvents. HMP-TAPA, being rich in the nitrogen site, showed a high CO 2 uptake of 106.7 mg/g with an IAST selectivity of 30.79 toward CO 2 over N 2 . Furthermore, HMP-TAPA showed high chemical and water stability without loss of any structural integrity. Besides CO 2 sorption, the catalytic activity of HMP-TAPA was checked for the cycloaddition of CO 2 and terminal epoxides, resulting in cyclic carbonate with high conversion (98%). They showed remarkable recyclability up to 5 cycles without loss of activity. Overall, this study represents a rare demonstration of the rational design of POPs (HMP-TAPA) for multiple applications.