CO2 Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

Motta, Ingrid Lopes; Arnold, Ross A.; Lopez-Tenllado, Francisco Javier; Filho, Rubens Maciel; Wolf Maciel, Maria Regina; Hill, Josephine M.

CO2 Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char

dc.contributor.author	Motta, Ingrid Lopes
dc.contributor.author	Arnold, Ross A.
dc.contributor.author	Lopez-Tenllado, Francisco Javier
dc.contributor.author	Filho, Rubens Maciel
dc.contributor.author	Wolf Maciel, Maria Regina
dc.contributor.author	Hill, Josephine M.
dc.date.accessioned	2020-12-08T18:33:19Z
dc.date.available	2020-12-08T18:33:19Z
dc.date.issued	2020-11-24
dc.description.abstract	In sugarcane bagasse gasification, char recirculation to the gasifier improves the syngas quality and process efficiency. To determine the effect of char properties on the reaction kinetics, in this work, the pregasification pyrolysis temperature, particle size, and catalyst (potassium) loading were varied. Char samples were prepared at 750–900 °C via pyrolysis and gasified isothermally in a thermogravimetric analysis unit at 850 °C with CO2, and gasification data were modeled using the random pore and extended random pore models. Increasing pyrolysis temperatures did not affect the char morphology and surface composition but did reduce the surface area, as determined by N2 adsorption, decreasing initial gasification rates, and the overall fitted rate constants. Reduction of the particle size via ball milling decreased the time required for complete conversion and changed the shape of the rate versus conversion curves from monotonically decreasing to concave down. The char sample prepared via pyrolysis at 900 °C was an exception, having a maximum rate at ∼10% conversion without ball milling. After ball milling of the char sample prepared at 750 °C, there was an accumulation of ash (Al and Si) on the surface of the particles and a reduction in the surface area, consistent with the ash blocking pores—the porosity in these samples increased during the initial stages (up to ∼20% conversion) of gasification. The gasification behavior was generally well modeled by the extended random pore model. Although the addition of KOH (K/Al mass ratio ∼ 0.2–1.25) enhanced the gasification rates, too much K—from the addition of KOH or after 90% conversion—created mass-transfer limitations resulting in lower gasification rates.	en_US
dc.description.grantingagency	Natural Sciences and Engineering Research Council (NSERC)	en_US
dc.identifier.doi	http://dx.doi.org/10.1021/acs.energyfuels.0c02786	en_US
dc.identifier.grantnumber	RGPIN/05076-2015	en_US
dc.identifier.uri	http://hdl.handle.net/1880/112813
dc.identifier.uri	https://doi.org/10.11575/PRISM/46042
dc.language.iso	eng	en_US
dc.publisher.department	Chemical & Petroleum Engineering	en_US
dc.publisher.faculty	Schulich School of Engineering	en_US
dc.publisher.hasversion	acceptedVersion	en_US
dc.publisher.institution	University of Calgary	en_US
dc.publisher.institution	University of Campinas	en_US
dc.rights	Unless otherwise indicated, this material is protected by copyright and has been made available with authorization from the copyright owner. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.	en_US
dc.subject	potassium	en_US
dc.subject	reaction products	en_US
dc.subject	adsorption	en_US
dc.subject	pyrolysis	en_US
dc.subject	Gasification	en_US
dc.title	CO2 Gasification of Sugarcane Bagasse Char: Consideration of Pyrolysis Temperature, Silicon and Aluminum Contents, and Potassium Addition for Recirculation of Char	en_US
dc.type	journal article	en_US
ucalgary.item.requestcopy	true	en_US