000075835 001__ 75835
000075835 005__ 20181127134207.0
000075835 0247_ $$2doi$$a10.1016/j.jaap.2018.11.007
000075835 0248_ $$2sideral$$a108606
000075835 037__ $$aART-2018-108606
000075835 041__ $$aeng
000075835 100__ $$aGreco, G.$$uUniversidad de Zaragoza
000075835 245__ $$aEvolution of the mass-loss rate during atmospheric and pressurized slow pyrolysis of wheat straw in a bench-scale reactor
000075835 260__ $$c2018
000075835 5060_ $$aAccess copy available to the general public$$fUnrestricted
000075835 5203_ $$aIn the present study, the effects of the absolute pressure (0.1 or 0.5 MPa) and the reactor atmosphere (pure N2 or a mixture of CO2/N2) on the pyrolysis behavior of wheat straw pellets (at 500 °C) were investigated. The most interesting aspect of this work was the use of a weighing platform (with a maximum capacity of 100 kg and a resolution of 0.5 g) to monitor the real-time mass-loss data for the biomass sample (with an initial mass of 400 g). It was observed that an increased pressure considerably affects the mass-loss profiles during the pyrolysis process, leading to higher devolatilization rates in a shorter period of time. Regardless of the pyrolysis atmosphere, an increase in the absolute pressure led to higher yields of gas at the expense of produced water and condensable organic compounds. This finding could be due to the fact that an increased pressure favors the exothermic secondary reactions of the intermediate volatile organic compounds in both liquid and vapor phases. The switch from pure N2 to a mixture of CO2 and N2 at 0.1 MPa also led to a remarkable increase in the yield of produced gas at the expense of the total liquid. This could be mainly due to the promotion of the thermal cracking of the volatile organic compounds at a high partial pressure of CO2, which is also consistent with the measured higher yields of CH4 and CO. The increased yield of CO can also be seen as a direct result of the enhanced reverse Boudouard reaction, which can also explain the much higher specific surface area (and ultra-micropore volume) measured for the biochar produced under the same operating conditions (0.1 MPa and a mixture CO2/N2 as pyrolysis medium).
000075835 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000075835 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000075835 700__ $$aVidegain, M.$$uUniversidad de Zaragoza
000075835 700__ $$aDi Stasi, C.$$uUniversidad de Zaragoza
000075835 700__ $$aGonzalez, B.$$uUniversidad de Zaragoza
000075835 700__ $$0(orcid)0000-0002-0118-3254$$aManyà, J. J.$$uUniversidad de Zaragoza
000075835 7102_ $$15005$$2555$$aUniversidad de Zaragoza$$bDpto. Ing.Quím.Tecnol.Med.Amb.$$cÁrea Ingeniería Química
000075835 773__ $$g136 (2018), 18-26$$pJ. anal. appl. pyrolysis$$tJOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS$$x0165-2370
000075835 8564_ $$s478239$$uhttps://zaguan.unizar.es/record/75835/files/texto_completo.pdf$$yPostprint
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000075835 909CO $$ooai:zaguan.unizar.es:75835$$particulos$$pdriver
000075835 951__ $$a2018-11-27-12:51:41
000075835 980__ $$aARTICLE