Geng Zhen, Xiao Qiangfeng, Lv Hong, Li Bing, Wu Haobin, Lu Yunfeng, Zhang Cunman
Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, China.
School of Materials Science and Technology, Tongji University, Shanghai 201804, China.
Sci Rep. 2016 Aug 4;6:30049. doi: 10.1038/srep30049.
The one-step synthesis method of nitrogen doped microporous carbon monoliths derived from biomass with high-efficiency is developed using a novel ammonia (NH3)-assisted activation process, where NH3 serves as both activating agent and nitrogen source. Both pore forming and nitrogen doping simultaneously proceed during the process, obviously superior to conventional chemical activation. The as-prepared nitrogen-doped active carbons exhibit rich micropores with high surface area and high nitrogen content. Synergetic effects of its high surface area, microporous structure and high nitrogen content, especially rich nitrogen-containing groups for effective CO2 capture (i.e., phenyl amine and pyridine-nitrogen) lead to superior CO2/N2 selectivity up to 82, which is the highest among known nanoporous carbons. In addition, the resulting nitrogen-doped active carbons can be easily regenerated under mild conditions. Considering the outstanding CO2 capture performance, low production cost, simple synthesis procedure and easy scalability, the resulting nitrogen-doped microporous carbon monoliths are promising candidates for selective capture of CO2 in industrial applications.
利用一种新型氨（NH₃）辅助活化工艺，开发了一种高效的由生物质衍生的氮掺杂微孔碳块体的一步合成方法，其中NH₃既作为活化剂又作为氮源。在此过程中，成孔和氮掺杂同时进行，明显优于传统化学活化。所制备的氮掺杂活性炭具有丰富的微孔、高比表面积和高氮含量。其高比表面积、微孔结构和高氮含量的协同效应，特别是富含用于有效捕获CO₂的含氮基团（即苯胺和吡啶氮），导致CO₂/N₂选择性高达82，这在已知的纳米多孔碳中是最高的。此外，所得的氮掺杂活性炭在温和条件下易于再生。考虑到出色的CO₂捕获性能、低生产成本、简单的合成程序和易于扩大规模，所得的氮掺杂微孔碳块体是工业应用中选择性捕获CO₂的有前途的候选材料。
