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Experimental and Modeling Studies of Torrefaction of Spent Coffee Grounds and Coffee Husk: Effects on Surface Chemistry and Carbon Dioxide Capture Performance

dc.contributor.authorMukherjee, Alivia
dc.contributor.authorOKOLIE, JUDE
dc.contributor.authorNiu, Catherine
dc.contributor.authorDalai, Ajay K.
dc.date.accessioned2023-10-04T19:59:25Z
dc.date.available2023-10-04T19:59:25Z
dc.date.issued2022
dc.descriptionCopyright © 2022 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY-NC-ND 4.0.en_US
dc.description.abstractTorrefaction of biomass is a promising thermochemical pretreatment technique used to upgrade the properties of biomass to produce solid fuel with improved fuel properties. A comparative study of the effects of torrefaction temperatures (200, 250, and 300 °C) and residence times (0.5 and 1 h) on the quality of torrefied biomass samples derived from spent coffee grounds (SCG) and coffee husk (CH) were conducted. An increase in torrefaction temperature (200–300 °C) and residence time (0.5–1 h) for CH led to an improvement in the fixed carbon content (17.9–31.8 wt %), calorific value (18.3–25 MJ/kg), and carbon content (48.5–61.2 wt %). Similarly, the fixed carbon content, calorific value, and carbon content of SCG rose by 14.6–29 wt %, 22.3–30.3 MJ/kg, and 50–69.5 wt %, respectively, with increasing temperature and residence time. Moreover, torrefaction led to an improvement in the hydrophobicity and specific surface area of CH and SCG. The H/C and O/C atomic ratios for both CH- and SCG-derived torrefied biomass samples were in the range of 0.93–1.0 and 0.19–0.20, respectively. Moreover, a significant increase in volatile compound yield was observed at temperatures between 250 and 300 °C. Maximum volatile compound yields of 11.9 and 6.2 wt % were obtained for CH and SCG, respectively. A comprehensive torrefaction model for CH and SCG developed in Aspen Plus provided information on the mass and energy flows and the overall process energy efficiency. Based on the modeling results, it was observed that with increasing torrefaction temperature to 300 °C, the mass and energy yield values of the torrefied biomass samples declined remarkably (97.3% at 250 °C to 67.5% at 300 °C for CH and 96.7% at 250 °C to 75.1% at 300 °C for SCG). The SCG-derived torrefied biomass tested for CO2 adsorption at 25 °C had a comparatively higher adsorption capacity of 0.38 mmol/g owing to its better textural characteristics. SCG would need further thermal treatment or functionalization to tailor the surface properties to attract more CO2 molecules under a typical post-combustion scenario.en_US
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC), BioFuel Net, and Canada Research Chair (CRC)en_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationMukherjee, A., Okolie, J. A., Niu, C., & Dalai, A. K. (2022). Experimental and Modeling Studies of Torrefaction of Spent Coffee Grounds and Coffee Husk: Effects on Surface Chemistry and Carbon Dioxide Capture Performance. ACS Omega, 7(1), 638–653. https://doi.org/10.1021/ACSOMEGA.1C05270/ASSET/IMAGES/MEDIUM/AO1C05270_M005.GIFen_US
dc.identifier.doi10.1021/acsomega.1c05270
dc.identifier.urihttps://hdl.handle.net/10388/15115
dc.language.isoenen_US
dc.publisherACS Publicationsen_US
dc.rightsAttribution-NonCommercial-NoDerivs 2.5 Canada*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ca/*
dc.subjectbeveragesen_US
dc.subjectbiomassen_US
dc.subjectcarbonen_US
dc.subjectmoistureen_US
dc.subjectprecursorsen_US
dc.titleExperimental and Modeling Studies of Torrefaction of Spent Coffee Grounds and Coffee Husk: Effects on Surface Chemistry and Carbon Dioxide Capture Performanceen_US
dc.typeArticleen_US

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