Synthesis of Triazine-Based Porous Organic Polymers Derived N-Enriched Porous Carbons for CO₂ Capture

Abstract

Porous carbon with both high CO2 uptake and CO2/N2 selectivity is desired for reducing the cost of carbon capture. Here, we report the preparation of N-enriched porous carbons (NPCs) derived from the low-cost triazine-based porous organic polymers using KOH as the activating agent under N2. The results indicate that the nitrogen content and textural properties of the NPCs can be effectively adjusted by the polymer precursors and the carbonization temperature. Impressively, the NPCs have an enriched N content (5.56–11.33 wt %) and abundant porosity (BET surface area: 394–1873 m2/g, pore volume: 0.27–1.56 cm3/g), endowing them with high CO2 uptake (120–207 mg/g at 273 K and 1.0 bar) and acceptable CO2/N2 selectivity (Henry’s law: 14.3–16.8). In particular, the ultra micropore volume (d ≤ 0.8 nm) is proven a key factor for the CO2 uptake, while both the ultra micropore volume and N content contribute the CO2/N2 selectivity. Our described work will provide a strategy to initiate developments of rationally designed porous carbons for various potential applications.