97168 20250319143307.0 doi 10.1016/j.fuel.2019.115807 sideral 112925 ART-2019-112925 eng Di Stasi, Christian Universidad de Zaragoza (orcid)0000-0001-5266-398X Physically activated wheat straw-derived biochar for biomass pyrolysis vapors upgrading with high resistance against coke deactivation 2019 Access copy available to the general public Unrestricted Wheat straw-derived biochars (produced through slow pyrolysis at 500 degrees C and 0.1 MPa) were physically (with CO2) and chemically (with K2CO3) activated to assess their performance as renewable and low-cost catalysts for biomass pyrolysis vapors upgrading. Preliminary cracking experiments, which were carried out at 700 degrees C using a mixture of four representative model compounds, revealed a clear correlation between the volume of micropores of the catalyst and the total gas production, suggesting that physical activation up to a degree of burn-off of 40% was the most interesting activation route. Next, steam reforming experiments were conducted using the most microporous material to analyze the effect of both the bed temperature and gas hourly space velocity (GHSV) on the total gas production. The results showed a strong dependence between the bed temperature and the total gas production, with the best result obtained at the highest temperature (750 degrees C). On the other hand, the change in GHSV led to minor changes in the total gas yield, with a maximum achieved at 14500 h(-1). Under the best operating conditions deduced in the previous stages, the addition of CO2 into the feed gas stream (partial pressure of 20 kPa) resulted in a total gas production of 98% with a H-2/CO molar ratio of 2.16. This good result, which was also observed during the upgrading of the aqueous phase of a real biomass pyrolysis oil, was ascribed to the relatively high coke gasification rate, which refresh the active surface area preventing deactivation by coke deposition. info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-17R info:eu-repo/grantAgreement/EC/H2020/721991/EU/Advanced Carbon Materials from Biowaste: Sustainable Pathways to Drive Innovative Green Technologies/ GreenCarbon This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 721991- GreenCarbon info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 5.578 2019 ENGINEERING, CHEMICAL 18 / 142 = 0.127 2019 Q1 T1 ENERGY & FUELS 24 / 112 = 0.214 2019 Q1 T1 1.797 2019 Energy Engineering and Power Technology 2019 Q1 Organic Chemistry 2019 Q1 Fuel Technology 2019 Q1 Chemical Engineering (miscellaneous) 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Alvira, Darío Universidad de Zaragoza (orcid)0000-0002-5526-3962 Greco, Gianluca Universidad de Zaragoza (orcid)0000-0001-6609-1601 González, Belén Universidad de Zaragoza (orcid)0000-0001-7125-4997 Manya, Joan J. Universidad de Zaragoza (orcid)0000-0002-0118-3254 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 790 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Tecnologi. Medio Ambiente 255 (2019), 115807 [10 pp.] Fuel Fuel 0016-2361 429503 http://zaguan.unizar.es/record/97168/files/texto_completo.pdf Postprint 137935 http://zaguan.unizar.es/record/97168/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:97168 articulos driver 2025-03-19-14:32:09 ARTICLE