Effect of nitrogen group on selective separation of CO2/N2 in porous polystyrene

Jun Wang, Jianhan Huang, Xiaofei Wu, Bin Yuan, Yinqiang Sun, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Hyper-crosslinked porous polystyrene adsorbents were successfully synthesized from 4-nitrobenzyl chloride using the Friedel-Crafts alkylation reaction. These porous polymer samples were characterized by SEM, TEM, FT-IR and TGA for their morphology, surface functionality and thermal stability. Nitrogen adsorption and desorption at 77K were used for characterizing their pore textural properties. The adsorption properties of CO2 and N2 were determined volumetrically at 298K and gas pressures up to 10bar. The experimental results showed that the porous polymer adsorbents have a relatively high N-content (up to 1.05%), a large BET surface area (up to 1275m2/g) and a large pore volume (up to 1.338cm3/g). It was observed that both pore texture and N-content in the porous polymers are equally important for adsorbing CO2. The equilibrium selectivity for CO2/N2 separation on the five samples is well correlated with the N-content and micropore volume percentage in the polymers, and the N-content strongly affects the adsorbent selection parameter. Adding N-functional group in porous polymer adsorbents is an effective way for improving their capability for CO2/N2 separation. Using the CO2 adsorption capacity alone is not sufficient for evaluating adsorbents, and the adsorbent selection parameter is calculated to screen adsorbents for CO2 capture from flue gas.

Original languageEnglish (US)
Pages (from-to)390-397
Number of pages8
JournalChemical Engineering Journal
Volume256
DOIs
StatePublished - Nov 15 2014
Externally publishedYes

Keywords

  • Adsorption
  • Hyper-crosslinked polymer
  • Nitrogen group effect
  • Selectivity

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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