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Influence of temperature and time on initial pyrolysis of cellulose and xylan
Högskolan i Borås, Akademin för textil, teknik och ekonomi. (Thermal and Combustion Process)
Högskolan i Borås, Akademin för textil, teknik och ekonomi.ORCID-id: 0000-0003-3239-019x
Högskolan i Borås, Akademin för textil, teknik och ekonomi.
Högskolan i Borås, Akademin för textil, teknik och ekonomi.
Vise andre og tillknytning
2020 (engelsk)Inngår i: Journal of Analytical and Applied Pyrolysis, ISSN 0165-2370, E-ISSN 1873-250X, Vol. Volume 147, nr 104782Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The aim of this study was to investigate the effects of temperature and reaction time on the primary pyrolysis of cellulose and xylan. Fast pyrolysis of cellulose and xylan was carried out with a micropyrolyser connected to a gas chromatograph-mass spectrometer/flame ionisation detector (GC–MS/FID) to separate and identify volatile components, both qualitatively and quantitatively. This set-up meant a minimum amount of secondary reactions, low impact of the heating period and at the same time provided rapid and accurate analyses. The two biomass components investigated were: cellulose and hemicellulose (represented by xylan). They were pyrolysed during 0.5, 1, 2 and 5 s (s) and within a temperature range of 400–600 °C. The results showed that levoglucosan (1, 6-anhydro β-D-glucopyranose) is the main chemical compound released during cellulose pyrolysis. It increased with increasing temperature and time. The main volatile compounds produced from pyrolysis of xylan are: 1-hydroxy-2-butanone, 4-hydroxy-5, 6-dihydro-(2 H)-pyran-2-one, 1-hydroxy-2-propanone (acetol), acetaldehyde and hydroxyacetaldehyde (HAA). HAA was the most abundant chemical compound released during xylan pyrolysis, increasing with higher temperatures and time. Acetol and acetaldehyde also showed similar behaviour. The chemical compounds released from cellulose and xylan fast pyrolysis are primary products and assumed to be produced directly from both cellulose and xylan molecules and not from secondary degradation. In this study, possible reaction routes during biomass primary pyrolysis are also suggested based on the product distribution from the thermal decomposition of cellulose and xylan.

sted, utgiver, år, opplag, sider
2020. Vol. Volume 147, nr 104782
Emneord [en]
Fast pyrolysis, Primary reactions, Py-GC-MS/FID, Cellulose, Xylan
HSV kategori
Forskningsprogram
Resursåtervinning
Identifikatorer
URN: urn:nbn:se:hb:diva-23155DOI: 10.1016/j.jaap.2020.104782ISI: 000523305000007Scopus ID: 2-s2.0-85079271304OAI: oai:DiVA.org:hb-23155DiVA, id: diva2:1426254
Tilgjengelig fra: 2020-04-24 Laget: 2020-04-24 Sist oppdatert: 2023-08-31bibliografisk kontrollert
Inngår i avhandling
1. Fast pyrolysis of biomass: primary products and reaction pathways
Åpne denne publikasjonen i ny fane eller vindu >>Fast pyrolysis of biomass: primary products and reaction pathways
2023 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Pyrolysis of biomass to produce liquid fuel and chemicals has been considered as an alternativeto fossil fuel because biomass has a lower environmental impact; moreover, it is renewable andcould be sustainable. However, the process of bio-oil production involves a series of complexchemical reactions which are dependent on the biomass feedstock and composition,temperature, heating rate as well as residence time. In this thesis, pyrolysis was carried out in amicro-pyrolyser connected to a gas chromatograph with a mass spectrometer/flame ionisationdetector to separate and identify the formed volatile compounds.

Firstly, the influence of temperature and residence time on the primary product yield andmechanistic pathways was investigated for the pyrolysis of cellulose, xylan and lignin attemperatures ranging between 400 – 600°C and residence times between 0.5 – 5 s. The resultshowed a general increase in the yield (count/μg sample) for most of the volatile compoundswith increasing temperature and residence time. Additionally, the interaction between theindividual biomass components was investigated. A comparison of the experimental andpredicted results showed that the product yields for some of the volatile compounds wereinhibited, especially for the cellulose-xylan-lignin blend and the native birch wood. This maybe due to the chemical interaction between the biomass and the presence of inorganic materials.The co-pyrolysis of palm kernel shell (PKS), mahogany (MAH) and iroko (IRO) sawdustshowed that the yield of the volatile compounds is dependent on the biomass composition andblend ratio. The co-pyrolysis of PKS, MAH and IRO in equal proportions showed an increasedrelative yield of the sugars compared to the other blend ratios investigated. Finally, the effectof dilute acid pretreatment on PKS, MAH and IRO sawdust prior to fast pyrolysis wasinvestigated. The removal of inorganic materials leads to increased yield, especially the sugarsand the furans. These results are important for understanding the formation mechanism of thepyrolysis products, selection of relevant operating conditions and the selection of a suitablemethodology that could enhance the pyrolysis product yield.

sted, utgiver, år, opplag, sider
Borås: Högskolan i Borås, 2023
Serie
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 145
Emneord
Fast pyrolysis, Py-GC-MS/FID, Primary reactions, Cellulose, Xylan, Lignin, Birch wood, Co-pyrolysis, Mahogany, Iroko, Palm kernel shell, Biomass blend, Biomass interaction, Pretreatment
HSV kategori
Forskningsprogram
Resursåtervinning
Identifikatorer
urn:nbn:se:hb:diva-30339 (URN)978-91-89833-23-4 (ISBN)978-91-89833-24-1 (ISBN)
Disputas
2023-09-22, C203, Allégatan 1, Borås, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2023-08-31 Laget: 2023-08-15 Sist oppdatert: 2023-09-18bibliografisk kontrollert

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