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Materials 2016, 9(5), 359; doi:10.3390/ma9050359

Water Vapor Adsorption on Biomass Based Carbons under Post-Combustion CO2 Capture Conditions: Effect of Post-Treatment

Instituto Nacional del Carbón, Instituto Nacional del Carbón-CSIC, Apartado 73, Oviedo 33080, Spain
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Academic Editor: Changle Chen
Received: 25 February 2016 / Revised: 22 April 2016 / Accepted: 5 May 2016 / Published: 12 May 2016
(This article belongs to the Section Porous Materials)
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Abstract

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. View Full-Text
Keywords: biomass based carbons; water vapor adsorption; CO2 capture biomass based carbons; water vapor adsorption; CO2 capture
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Querejeta, N.; Plaza, M.G.; Rubiera, F.; Pevida, C. Water Vapor Adsorption on Biomass Based Carbons under Post-Combustion CO2 Capture Conditions: Effect of Post-Treatment. Materials 2016, 9, 359.

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