Nitrogen-doped porous carbon for excellent CO2 capture: A novel method for preparation and performance evaluation

Jianfei Xiao, Xiaofang Yuan, Tian C. Zhang, Like Ouyang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Heteroatomic doped porous carbon (HPCs) is a promising advanced material, showing great application potential in greenhouse gas capture. Here, in-situ N-doped porous carbon (NPC) was developed via a novel and readily scalable strategy − one-step solvent-free melt polycondensation assisted by organic potassium salts, followed by pyrolysis and activation. As both a template and an activator, the added C6H5K3O7 played an important role to create abundant microporous structure. The as-fabricated NPC-650–0.5 showed a rich N content (6.11 at.%), abundant narrow micro-porosity (0.3437 cm3·g−1), and a high surface area (1209.37 m2·g−1) and delivered an excellent CO2 static adsorption capacity (4.16 mmol·g−1 and 8.40 mmol·g−1 at 100 and 500 kPa), a fast adsorption kinetics (circa 98% of balance capacity in 12 min), moderate heat of adsorption (25 to 30 kJ/mol), high selectivity of CO2/N2, and outstanding uninterrupted recyclability. Both the narrow micropore volume and N-doping sites had strong effects on the CO2 adsorption capacity, indicating a physical and chemical adsorption process with the mechanism being multi-layer adsorption by the micropore filling. This work highlights the great potential of the NPC-650–0.5 for capturing CO2 and offers new insights into a green activator and a simple and easy-to-scale method for preparing HPCs.

Original languageEnglish (US)
Article number121602
JournalSeparation and Purification Technology
Volume298
DOIs
StatePublished - Oct 1 2022

Keywords

  • Organic potassium salts
  • Porous carbon
  • Pressure swing CO adsorption
  • Solvent-free melt polycondensation
  • Uninterrupted cycle operation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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