Efficient Removal of Ammonia by Hierarchically Porous Carbons from a CO2 Capture Process

Jeong Ho Choi, Jong Tak Jang, Soung Hee Yun, Won Hee Jo, Seong Seon Lim, Joung Ho Park, Il Soo Chun, Jung Hyun Lee, Yeo Il Yoon

Research output: Contribution to journalArticlepeer-review

Abstract

The amine-based post-combustion carbon capture process is one of the most efficient methods for treating large-scale CO2, but it produces hazardous products due to chemical transition and degradation of the absorbents. In this study, carbon-based materials were used as adsorbents for the removal of NH3, and their adsorption capacities, adsorption rates, and stabilities were examined by comparing commercial activated carbon (AC) with hierarchically porous carbon (HPC). HPC-Step4 possessed a higher number of total acid sites, resulting in higher NH3 adsorption compared to AC. Despite the similar porosity, HPC-Step4 exhibited a higher adsorption rate constant and the improved kinetics was attributed to its increased portion of mesopores, enhancing the diffusion rate of the adsorbate. Furthermore, HPC-Step4 exhibited better reaction stability than AC.

Original languageEnglish
Pages (from-to)2031-2040
Number of pages10
JournalChemical Engineering and Technology
Volume43
Issue number10
DOIs
Publication statusPublished - 2020 Oct 1

Keywords

  • Adsorption
  • Ammonia
  • Hierarchically porous carbons
  • Post-combustion carbon capture

ASJC Scopus subject areas

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

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