In this work, highly efficient nitrogen-doped porous carbonaceous CO₂ sorbents were synthesized by sodium amide activation of petroleum coke at a temperature range of 400–500 °C. The as-obtained sorbents exhibit an excellent CO₂ uptake of 3.84 mmol/g (25 °C) and 5.93 mmol/g (0 °C) under atmospheric pressure. It is found that in addition to the two well-accepted factors, i.e., narrow micropore volume and nitrogen content, the pore size and pore size distribution also exhibit important effects on CO₂ uptake under ambient condition for these adsorbents. Furthermore, these petroleum-coke-derived nitrogen-enriched carbonaceous sorbents also exhibit other merits such as high selectivity of CO₂ over N₂, excellent recyclability, fast adsorption kinetics, suitable heat of adsorption, and excellent dynamic CO₂ uptake. This paper offers additional insight and useful information in preparing highly efficient nitrogen-doped porous carbonaceous CO₂ adsorbents.

中文翻译：

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低温活化石油焦炭中碳酸钠一步法合成氮捕获多孔碳用于CO ₂捕集

在这项工作中，通过在400-500°C的温度范围内通过石油焦炭的氨基酰胺钠活化合成了高效的氮掺杂多孔碳质CO ₂吸附剂。所获得的吸附剂在大气压下表现出出色的CO ₂吸收率，分别为3.84 mmol / g（25°C）和5.93 mmol / g（0°C）。发现除了两个良好接受的因素，即狭窄的微孔体积和氮含量之外，孔径和孔径分布还对这些吸附剂在环境条件下对CO ₂吸收具有重要影响。此外，这些石油焦衍生的富氮碳质吸附剂还具有其他优点，例如，CO ₂对N _2的选择性高。，优异的可回收性，快速的吸附动力学，合适的吸附热和出色的动态CO ₂吸收能力。本文为制备高效氮掺杂的多孔碳质CO ₂吸附剂提供了更多的见识和有用的信息。