Renewable N-doped microporous carbons from walnut shells for CO2 capture and conversion,Sustainable Energy & Fuels

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Renewable N-doped microporous carbons from walnut shells for CO2 capture and conversion
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2021-08-10 , DOI: 10.1039/d1se01000j
Xianzhao Shao ₁ , Yujia Zhang ₁ , Xinyi Miao ₁ , Wei Wang ₁ , Zhifeng Liu ₁ , Quan Liu ₁ , Tianlei Zhang ₁ , Jianwei Ji ₁ , Xiaohui Ji ₁

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The development of advanced porous carbon-based materials is a burgeoning field, especially for CO₂ capture and utilization. In this research, renewable, microporous granular nitrogen-doped carbons were prepared by KOH activation of melamine modified walnut shells making use of two different protocols at a relatively low pyrolysis temperature (650 °C). The microporous carbons had a 0.6–1.5 nm micropore size and exhibited high surface areas of 949–2847 m² g⁻¹. Furthermore, the synthesized microporous carbons manifested a good capacity to capture CO₂ owing to the existence of a large number of narrow micropores and nitrogen-bearing functionalities. The equilibrium CO₂ capture capacities of these carbons at 1 atm were respectively in ranges of 4.1–6.6 and 2.7–4.0 mmol g⁻¹ at 0 °C and 25 °C. Even in a CO₂/N₂ mixture, it exhibited a high selectivity for the capture of CO₂ with a separation factor of 19. Thanks to its excellent CO₂ adsorption capability, the incorporation of Ag(0) nanoparticles makes it serve as an efficient catalyst for the conversion of propargylic alcohols with CO₂ into carbonates via a cycloaddition reaction under mild conditions. The sorbent has a multitude of advantages including the ease of its synthesis, high CO₂ uptake capacity, low cost, regenerability, and selectivity, which demonstrate that great potential is manifested by nanoporous nitrogen-doped carbon for CO₂ capture and utilization.

中文翻译：

来自核桃壳的可再生 N 掺杂微孔碳用于 CO2 捕获和转化

先进多孔碳基材料的开发是一个新兴领域，尤其是在 CO ₂捕获和利用方面。在这项研究中，利用两种不同的方案在相对较低的热解温度（650°C）下，通过三聚氰胺改性核桃壳的 KOH 活化制备了可再生的微孔粒状氮掺杂碳。微孔碳具有 0.6-1.5 nm 的微孔尺寸，并表现出 949-2847 m ² g ^{-1 的}高表面积。此外，由于存在大量狭窄的微孔和含氮功能，合成的微孔碳表现出良好的捕获CO _{2 的}能力。平衡 CO ₂这些碳在 1 个大气压下的捕获能力分别在 4.1–6.6 和 2.7–4.0 mmol g ^{-1 的}范围内，在 0 °C 和 25 °C 下。即使在 CO ₂ /N ₂混合物中，它也表现出对 CO ₂捕获的高选择性，分离系数为 19。由于其出色的 CO ₂吸附能力，Ag(0) 纳米颗粒的掺入使其成为在温和条件下通过环加成反应将炔丙醇与 CO ₂转化为碳酸酯的有效催化剂。该吸附剂具有许多优点，包括易于合成、高 CO ₂吸收能力、低成本、可再生性和选择性，这表明纳米多孔氮掺杂碳在捕获和利用CO _{2 方面}具有巨大潜力。

更新日期：2021-08-23

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