The biomass-derived N-doped porous carbons have been proved promising adsorbent material, due to their good CO₂/N₂ selectivity and excellent CO₂ adsorption performance. However, many researchers simply studied the effect of nitrogen groups or narrow micropores (less than 0.7 nm) on CO₂ uptake at 1 bar and ignored the role of different pressures. In this study, a promising porous carbon derived from eucalyptus bark with high CO₂ adsorption capacity was prepared by urea-assisted hydrothermal and KOH activation. The obtained porous carbons were found to be mainly microporous and showed rich nitrogen content. Among the materials, at 1 bar, NPC700 exhibits high CO₂ adsorption of 4.20 mmol/g and 6.98 mmol/g at 25 °C and 0 °C, respectively. Based on Grand canonical Monte Carlo (GCMC) simulation, the adsorption density and adsorption energy on graphite slit pore with different pore sizes (0.6–2.0 nm) and N-doped functional groups (pyridinic-N, pyrrole-N and graphitic-N) were calculated. And the results showed that the nitrogen functional groups played a crucial contribution on CO₂ adsorption capacity at relative low pressure (0–0.16 bar). In the case of relative high pressure (0.16–1 bar), the narrow micropores volume determined the CO₂ uptake capacity.

由于其良好的CO ₂ /N ₂选择性和优异的CO ₂吸附性能，生物质衍生的N掺杂多孔碳已被证明是有前途的吸附材料。然而，许多研究人员只是简单地研究了氮基团或狭窄的微孔（小于 0.7 nm）对1 bar 下CO ₂吸收的影响，而忽略了不同压力的作用。在这项研究中，通过尿素辅助水热和 KOH 活化制备了一种具有高 CO ₂吸附能力的有前途的桉树皮多孔碳。发现获得的多孔碳主要是微孔的并且显示出丰富的氮含量。在这些材料中，在 1 bar 时，NPC700 表现出高 CO ₂在 25 °C 和 0 °C 下的吸附量分别为 4.20 mmol/g 和 6.98 mmol/g。基于Grand canonical Monte Carlo (GCMC)模拟，不同孔径（0.6-2.0 nm）和N掺杂官能团（吡啶-N、吡咯-N和石墨-N）的石墨狭缝孔的吸附密度和吸附能被计算。结果表明，氮官能团在相对低压（0-0.16 bar）下对CO ₂吸附能力起着至关重要的作用。在相对高压（0.16-1 bar）的情况下，狭窄的微孔体积决定了 CO ₂吸收能力。