Novel porous carbon materials with ultrahigh nitrogen contents for selective CO 2 capture

Yunfeng Zhao, Lan Zhao, Ke Xin Yao, Yang Yang, Qiang Zhang, Yu Han

Research output: Contribution to journalArticle

Abstract

Nitrogen-doped carbon materials were prepared by a nanocasting route using tri-continuous mesoporous silica IBN-9 as a hard template. Rationally choosing carbon precursors and carefully controlling activation conditions result in an optimized material denoted as IBN9-NC1-A, which possesses a very high nitrogen doping concentration (∼13 wt%) and a large surface area of 890 m 2 g -1 arising from micropores (<1 nm). It exhibits an excellent performance for CO 2 adsorption over a wide range of CO 2 pressures. Specifically, its equilibrium CO 2 adsorption capacity at 25 °C reaches up to 4.50 mmol g -1 at 1 bar and 10.53 mmol g -1 at 8 bar. In particular, it shows a much higher CO 2 uptake at low pressure (e.g. 1.75 mmol g -1 at 25 °C and 0.2 bar) than any reported carbon-based materials, owing to its unprecedented nitrogen doping level. The high nitrogen contents also give rise to significantly enhanced CO 2/N 2 selectivities (up to 42), which combined with the high adsorption capacities, make these new carbon materials promising sorbents for selective CO 2 capture from power plant flue gas and other relevant applications.

Original languageEnglish (US)
Pages (from-to)19726-19731
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number37
DOIs
StatePublished - Oct 7 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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