Facile synthesis of triazine-triphenylamine-based microporous covalent polymer adsorbent for flue gas CO2 capture

- A triazine-based microporous covalent polymer was prepared under mild conditions.
- High surface area (1104 m2/g), CO2 uptake (3.12 mmol/g) and Henry selectivity (64).
- High CO2/N2 selectivity of 58 in mixture breakthrough study.

The sustainable capture and sequestration of CO2 from flue gas emission is an important and unavoidable challenge to control greenhouse gas release and climate change. In this report, we describe a triazine-triphenylamine-based microporous covalent organic polymer under mild synthetic conditions. 13C and 15N solid-state NMR and FTIR analyses confirm the linkage of the triazine and triphenylamine components in the porous polymer skeleton. The material is composed of spherical particles 1.0 to 2.0 μm in size and possesses a high surface area (1104 m2/g). The material exhibits superb chemical robustness under acidic and basic conditions and high thermal stability. Single-component gas adsorption exhibits an enhanced CO2 uptake of 3.12 mmol/g coupled with high sorption selectivity for CO2/N2 of 64 at 273 K and 1 bar, whereas the binary gas mixture breakthrough study using a model flue gas composition at 298 K shows a high CO2/N2 selectivity of 58. The enhanced performance is attributed to the high Lewis basicity of the framework, as it favors the interaction with CO2.

A triazine-triphenylamine based microporous covalent organic polymer was prepared through Friedel-Craft reaction under mild conditions. The Framework Lewis basicity favors the interaction with CO2, which results in enhanced CO2 capacity and high CO2/N2 selectivity, promoted the material as a potential adsorbent for flue gas CO2 capture.365