当前位置: X-MOL 学术J. CO2 Util. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Base-type nitrogen doping in zeolite-templated carbon for enhancement of carbon dioxide sorption
Journal of CO2 Utilization ( IF 7.7 ) Pub Date : 2022-06-22 , DOI: 10.1016/j.jcou.2022.102084
Su-Kyung Lee , Seung Won Han , Ga-Young Cha , Jong Min Park , Hanyoung Park , Ryong Ryoo , U-Hwang Lee

Nitrogen-doped microporous carbons were synthesized via pyrolytic carbonization of pyrrole in a FAU zeolite template, using a carbonization temperature of either 600 or 700 °C. The carbon products, which were freed by dissolution of the template, all possessed a zeolite-like ordered pore arrangement with a high specific surface area of 2300–2500 m2 g−1 and a sharp distribution of pore diameters centered at 0.9 nm. The N content was similarly 5 wt%, but X-ray photoelectron spectroscopy analysis indicated that the 600 °C-pyrolized carbon had a relatively higher content of base-type N atoms (i.e., pyridinic and pyrrolic) than non-basic N (graphenic and oxidic), compared to the case at 700 °C. The 600 °C-pyrolized carbon exhibited an outstandingly high CO2 uptake. A breakthrough test with a CO2-H2O-N2 mixture at 1 bar indicated that the 600 °C-pyrolized carbon could capture CO2 effectively under humid conditions. This result suggests that it is important for CO2 capture, to achieve a high N content when doping with pyridinic or pyrrolic N as the major species. The high adsorption performance of zeolite-template carbon was attributable to the higher content of pyridinic N and pyrrolic N over graphitic N in the carbon, which provided basicity resulting in a strong chemisorption interaction with CO2.



中文翻译:

沸石模板碳中的碱型氮掺杂增强二氧化碳吸附

氮掺杂微孔碳是通过在 FAU 沸石模板中热解碳化吡咯合成的,碳化温度为 600 或 700 °C。通过模板溶解释放的碳产物都具有类似沸石的有序孔排列,具有2300-2500 m 2 g -1的高比表面积和以0.9 nm为中心的孔径分布。N 含量同样为 5 wt%,但 X 射线光电子能谱分析表明,600 ℃热解碳的碱型 N 原子(即吡啶和吡咯)含量相对高于碱性 N(石墨烯和氧化物),与 700 °C 的情况相比。600 °C 的热解碳表现出非常高的 CO2摄取。在 1 bar 下使用 CO 2 -H 2 O-N 2混合物进行的突破性测试表明,600 °C 热解碳可以在潮湿条件下有效捕获 CO 2 。该结果表明,当以吡啶或吡咯N作为主要物质掺杂时,实现高N含量对于CO 2捕获很重要。沸石-模板碳的高吸附性能归因于碳中吡啶氮和吡咯氮的含量高于石墨氮,这提供了碱性,导致与CO 2的强烈化学吸附相互作用。

更新日期:2022-06-23
down
wechat
bug