126352 20241125101140.0 doi 10.1016/j.powtec.2023.118539 sideral 133797 ART-2023-133797 eng Gil, Antonia Universidad de Zaragoza (orcid)0000-0002-0704-4685 Pyrolysis and CO2 gasification of barley straw: Effect of particle size distribution and chemical composition 2023 Access copy available to the general public Unrestricted We evaluate how the heterogeneity of the precursor may affect pyrolysis and CO2 gasification behavior aimed at activated carbon applications. Barley straw, ground and classified into five size ranges, is characterized by non-isothermal thermogravimetry tests at various heating rates. Fixed carbon and volatile matter contents decrease with particle size. Also, the finest fraction is enriched in minerals by exogenous contamination and accumulation of silicon-rich leaves. Faster pyrolysis kinetics are found for small sizes, caused by their higher alkali contents and heat-mass transfer rates. Char-CO gasification conversion rates show an unexpected behavior, not previously reported. Higher reactivity is found for the finest fraction, decreasing significantly at temperatures beyond 750 °C. The high alkali content of the finest fraction promotes the catalytic effect of minerals on gasification reactivity at lower temperatures, hindering the reaction at higher temperatures by forming low-melting-point potassium silicates. Results help improve pretreatment strategies to enhance activated carbon quality. info:eu-repo/grantAgreement/ES/MICINN/RTI2018-095349-A-I00 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.5 2023 ENGINEERING, CHEMICAL 44 / 170 = 0.259 2023 Q2 T1 0.97 2023 Chemical Engineering (miscellaneous) 2023 Q1 9.9 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Pallarés, Javier Universidad de Zaragoza (orcid)0000-0002-4819-3636 Arauzo, Inmaculada Universidad de Zaragoza (orcid)0000-0001-5473-6919 Cortés, Cristóbal Universidad de Zaragoza (orcid)0000-0001-6665-5331 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 424 (2023), 118539 [17 pp.] Powder technol. Powder Technology 0032-5910 5449143 http://zaguan.unizar.es/record/126352/files/texto_completo.pdf Versión publicada 1966238 http://zaguan.unizar.es/record/126352/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:126352 articulos driver 2024-11-22-12:02:21 ARTICLE