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

Porous carbon with both high CO 2 uptake and CO 2 /N 2 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 N 2 . 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 m 2 /g, pore volume: 0.27–1.56 cm 3 /g), endowing them with high CO 2 uptake (120–207 mg/g at 273 K and 1.0 bar) and acceptable CO 2 /N 2 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 CO 2 uptake, while both the ultra micropore volume and N content contribute the CO 2 /N 2 selectivity. Our described work will provide a strategy to initiate developments of rationally designed porous carbons for various potential applications.