Mechanism of biomass activation and ammonia modification for nitrogen-doped porous carbon materials.
Bioresour Technol
; 280: 260-268, 2019 May.
Article
em En
| MEDLINE
| ID: mdl-30776652
ABSTRACT
The effect of chemical activation and NH3 modification on activated carbons (ACs) was explored via two contrasting bamboo pyrolysis strategies involving either two steps (activation followed by nitrogen doping in NH3 atmosphere) or one step (activation in NH3 atmosphere) with several chemical activating reagents (KOH, K2CO3, and KOHâ¯+â¯K2CO3). The ACs produced by the two-step method showed relatively smaller specific surface areas (â¼90% micropores) and lower nitrogen contents. From the one-step method, the ACs had larger pore diameters with about 90% small mesopores (2-3.5â¯nm). Due to a promotion effect with the KOHâ¯+â¯K2CO3 combination, the AC attained the greatest surface area (2417â¯m2â¯g-1) and highest nitrogen content (3.89â¯wt%), endowing the highest capacitance (175â¯Fâ¯g-1). The balance between surface area and nitrogen content recommends KOHâ¯+â¯K2CO3 activation via the one-step method as the best choice for achieving both greener production process and better pore structure.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Carbono
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Biomassa
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Amônia
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Nitrogênio
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article