N-doped porous carbons (NPCs) are promising adsorbents for CO₂ capture and sequestration. Herein a series of NPCs was easily prepared from imidazole-based hyper-cross-linked polymers (HCPs) by KOH chemical activation, and the nitrogen (N) content and porosity of the NPCs were carefully tuned by using pre-designed HCPs prepared from N-vinylimidazole (VIM) with the different feeding amount in the polymerization. The results indicate that the NPCs have a controllable N content (0.44–2.81 wt%) and porosity (BET surface area: 1248–2059 m²/g, pore volume: 0.80–1.12 cm³/g). These NPCs have a high CO₂ uptake (180–258 mg/g at 273 K and 1.0 bar, 41–73 mg/g at 273 K and 0.15 bar) at a low pressure. In particular, the N content plays negligible role as compared to the porosity, and the CO₂ uptake is linearly dependent on the pore volume for narrow micropores (V_d, d < 1.2 nm) and the ratio of V_d (d < 1.4 nm) in relation to the total pore volume (V_total). These NPCs own low isosteric heat of adsorption (20.0–29.9 kJ/mol), excellent recycling performance, and acceptable CO₂/N₂ selectivity (Henry's law: 10.5–12.9). Our study provides promising porous carbons for CO₂ capture and offers outstanding strategy for design and synthesis of the porous materials.

N掺杂多孔碳（NPC）是用于CO ₂捕获和隔离的有前途的吸附剂。本文中，通过KOH化学活化，可以轻松地从基于咪唑的超交联聚合物（HCP）制备一系列NPC，并使用预先设计的由N制备的HCP仔细调节NPC的氮（N）含量和孔隙率。 -乙烯基咪唑（VIM）在聚合反应中的进料量不同。结果表明，NPC具有可控的N含量（0.44-2.81 wt％）和孔隙率（BET表面积：1248-2059 m ² / g，孔体积：0.80-1.12 cm ³ / g）。这些NPC的CO ₂高在低压下摄取（在273 K和1.0 bar下为180-258 mg / g，在273 K和0.15 bar下为41-73 mg / g）。特别地，与孔隙率相比，N含量的作用微不足道，CO _2的吸收量线性依赖于窄微孔（V _d，d <1.2 nm）的孔体积和V _d的比（d <1.4 nm）。 ）相对于总孔体积（V _total）。这些NPC具有低等规吸附热（20.0-29.9 kJ / mol），出色的回收性能和可接受的CO ₂ / N ₂选择性（亨利定律：10.5-12.9）。我们的研究为CO ₂提供了有希望的多孔碳 捕获并为多孔材料的设计和合成提供出色的策略。