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Efficient Removal of Ammonia by Hierarchically Porous Carbons from a CO 2 Capture Process
Author(s) -
Choi Jeong Ho,
Jang Jong Tak,
Yun Soung Hee,
Jo Won Hee,
Lim Seong Seon,
Park Joung Ho,
Chun Il Soo,
Lee Jung-Hyun,
Yoon Yeo Il
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000104
Subject(s) - adsorption , carbon fibers , mesoporous material , ammonia , activated carbon , chemical engineering , porosity , diffusion , chemistry , reaction rate constant , kinetics , degradation (telecommunications) , amine gas treating , combustion , inorganic chemistry , materials science , organic chemistry , catalysis , composite number , thermodynamics , composite material , computer science , engineering , telecommunications , physics , quantum mechanics
The amine‐based post‐combustion carbon capture process is one of the most efficient methods for treating large‐scale CO 2 , 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 NH 3 , 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 NH 3 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.