Journal
MATERIALS
Volume 9, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/ma9050359
Keywords
biomass based carbons; water vapor adsorption; CO2 capture
Categories
Funding
- HiPerCap Project of the European Union 7th Framework Programme FP7 [60855]
- Gobierno del Principado de Asturias [PCTI-GRUPIN14-079]
- Gobierno del Principado de Asturias
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The effect of post-treatment upon the H2O adsorption performance of biomass-based carbons was studied under post-combustion CO2 capture conditions. Oxygen surface functionalities were partially replaced through heat treatment, acid washing, and wet impregnation with amines. The surface chemistry of the final carbon is strongly affected by the type of post-treatment: acid treatment introduces a greater amount of oxygen whereas it is substantially reduced after thermal treatment. The porous texture of the carbons is also influenced by post-treatment: the wider pore volume is somewhat reduced, while narrow microporosity remains unaltered only after acid treatment. Despite heat treatment leading to a reduction in the number of oxygen surface groups, water vapor adsorption was enhanced in the higher pressure range. On the other hand acid treatment and wet impregnation with amines reduce the total water vapor uptake thus being more suitable for post-combustion CO2 capture applications.
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