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Title

Sustainable coffee‐based CO2 adsorbents: toward a greener production via hydrothermal carbonization

AuthorsQuerejeta Montes, Nausika ; Gil Matellanes, María Victoria ; Rubiera González, Fernando ; Pevida García, Covadonga
KeywordsCoffee grounds
Hydrothermal carbonization
Activated carbon
Response Surface Methodology
Post-combustion CO2 capture.
Issue Date1-Nov-2017
PublisherJohn Wiley & Sons
CitationGreenhouse Gases- Science and Technology 8(2): 309-323 (2018)
AbstractActivated carbons for adsorption of CO2 under flue gas conditions were prepared by means of hydrothermal carbonization (HTC) and subsequent CO2 activation of spent coffee grounds. The HTC of the samples consisted of their heating at moderate temperature with a high water content in autoclave. A preliminary screening concluded that 1:2 biomass/water ratio (spent coffee grounds as received) and no chemicals added during HTC with further activation in CO2 at 800°C for 1 h are suitable conditions to produce the CO2 adsorbents. In addition, the response surface methodology (RSM) successfully evaluated the combined effect of HTC temperature and dwell time, to maximize the CO2 capture capacity within the experimental region. Both the lowest temperature and dwell time (120°C, 3 h) resulted in the maximum CO2 capture capacity (2.95 wt.%). Two activated carbons (ACs) were then produced: one via hydrothermal carbonization optimized by means of response surface methodology (RSM) followed by CO2 activation (HC‐Co) and the other one by single‐step CO2 activation as described in the Group's patent ES2526259 (AC‐Co). Analysis of the features and performances of the two ACs revealed superior chemical and textural characteristics on HC‐Co for CO2 adsorption under post‐combustion capture conditions; HTC process is the sole responsible of this enhancement. Moreover, the proposed methodology to produce CO2 adsorbents from spent coffee grounds represents a more energy‐efficient approach
DescriptionThis is the peer reviewed version of the following article: Querejeta, N. , Gil, M. V., Rubiera, F. and Pevida, C. (2018), Sustainable coffee‐based CO2 adsorbents: toward a greener production via hydrothermal carbonization. Greenhouse Gas Sci Technol, 8: 309-323. doi:10.1002/ghg.1740, which has been published in final form at https://doi.org/10.1002/ghg.1740. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions
Publisher version (URL)https://doi.org/10.1002/ghg.1740
URIhttp://hdl.handle.net/10261/167562
DOI10.1002/ghg.1740
E-ISSN2152-3878
Appears in Collections:(INCAR) Artículos
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