Application of a detailed biomass pyrolysis kinetic scheme to hardwood and softwood torrefaction

Anca-Couce, Andrés; Obernberger, Ingwald

doi:10.1016/j.fuel.2015.11.062

Cited by 90 publications

(41 citation statements)

References 29 publications

(43 reference statements)

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“…Additionally, water is also formed by cracking, the reaction of oxygen 6 functional groups at higher temperatures 44 or by dehydratation of the hydroxy group in cellulose 7 and hemicellulose 45 . The reported maximum peak of carbon dioxide at 360 °C is in agreement 8 with the results obtained in this study. The residual release of carbon dioxide starting at 400 °C is 9 probably connected with the polymerization reactions of coking in the solid phase 43 .…”

Section: Ftir Analysissupporting

confidence: 92%

“…This trend confirms that the solid residue was more charred due to the increasing temperature. 8 compounds were identified based on the NIST and Wiley electronic libraries. 4 5 For the model-fitting procedure, the following eight mechanisms were assumed.…”

Section: Resultsmentioning

confidence: 99%

“…This trend c 2 that the solid residue was more charred due to the increasing temperature. The results of the 13 C NMR analysis of solid residues of beech are shown in 8 Comparing the NMR spectra for individual temperatures, two distinct temperature secti 9 be identified, below and above 300 °C. The spectra in the first section seemed to be id…”

Section: Nmr Analysismentioning

confidence: 99%

“…In the long history of solid-state kinetic theory, pyrolysis of cellulose [1][2][3][4][5] , hemicellulose [6][7][8] , and lignin [8][9][10] , as the key representative lignocellulosic materials, have been thoroughly studied. Although pyrolysis reaction dynamics and reaction schemes for the whole lignocellulosic substrate have evolved substantially, many questions concerning the pyrolysis mechanism remain, due to the high complexity of the reactions and the many variations in the physical and chemical properties of biomass 11 .…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Study of the Thermochemical Degradation of Lignocellulosic Materials Based on TG-FTIR, Py-GC/MS and 13 C NMR Experiments

Hrablay

Jelemenský

2016

Chem.Biochem.Eng.Q.

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Pyrolysis of a hardwood representative, beech sawdust (Fagus sylvatica), was investigated by thermogravimetry, a thermal analysis technique. A suitable kinetic approach for the determination of kinetic parameters was proposed. The model fitting method was used to optimize the kinetic parameters of the reaction pathways of the selected reaction mechanisms. The experiments were conducted starting from ambient temperature up to 600 °C using the following five heating rates: 2, 5, 10, 15, and 20 °C min -1 . FTIR, Py-GC/MS, 13 C NMR, and elemental analysis were also used to analyse the pyrolysis products. Differentiation among the reaction mechanisms of lignocellulosic material pyrolysis was performed. The three-step parallel mechanism containing an intermediate was the most suitable mechanism based on 13 C NMR analysis of solid residues prepared at the selected temperatures from 230-500 °C. The NMR results showed that the inclusion of an intermediate into the reaction scheme was a reasonable step. It was concluded that the intermediate was connected with the lignin structure.

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Section: Ftir Analysissupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Nmr Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetic Study of the Thermochemical Degradation of Lignocellulosic Materials Based on TG-FTIR, Py-GC/MS and 13 C NMR Experiments

Hrablay

Jelemenský

2016

Chem.Biochem.Eng.Q.

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“…To elucidate the true effect of them etal-doped catalysts,w e first present the product distribution for acontrol experiment (first columnso fT ables 2a nd 3) in whichn oc atalyst was applied. As expected, the results of noncatalytic pyrolysis (control pyrolysis experiment) indicate the predominance of oxygenates.A sm any studies have illustrated, [5,42] acetic acid is am ajor oxygenate obtained from the pyrolytic breakdown of lignocellulosic biomass,a nd the pyrolysis of E. urophylla was not different at the study temperature of 600 8C. This is followed by the highly oxygenated sugar oligomer levoglucosan and acetol.…”

Section: Catalytic Versus Noncatalyticpyrolysis:d Etailed Product Dismentioning

confidence: 82%

Aromatic Hydrocarbon Production from Eucalyptus urophylla Pyrolysis over Several Metal‐Modified ZSM‐5 Catalysts

2016

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Metal‐modified HZSM‐5 catalysts were prepared by the ion exchange of NH4ZSM‐5 (SiO2/Al2O3=23) using Zn, Ga, Ni, and combinations thereof. The prepared catalysts were used to evaluate catalytic pyrolysis for the conversion of Eucalyptus urophylla to fuels and chemicals, specifically aromatic hydrocarbons, by using a micro‐scale pyrolysis reactor coupled with GC–MS. Two different biomass‐to‐catalyst ratios (1:5 and 1:10 w/w) were studied. The catalyst prepared with Ga by total ion exchange (Ga‐HZSM‐5 B, ≈7 wt % Ga) yielded the highest amount of aromatic hydrocarbons, whereas the catalysts modified with Ni produced the lowest yield of aromatic hydrocarbons. A correlation between the methane yield and benzene and p‐xylene selectivity was found for the catalysts, which was observed mainly for the Ni‐, Zn‐, and Ga‐Ni‐modified catalysts. The Ga‐modified catalysts were the most selective for xylenes, whereas the Ni‐based catalysts were the most selective for benzene production with a concurrent increase in methane production. The Zn‐modified catalysts were the most selective for toluene production.

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Biomass Fast Pyrolysis for Hydrogen Production from Bio‐Oil

Bizkarra

Barrio

Arias

et al. 2017

Hydrogen Production Technologies

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Application of a detailed biomass pyrolysis kinetic scheme to hardwood and softwood torrefaction

Cited by 90 publications

References 29 publications

Kinetic Study of the Thermochemical Degradation of Lignocellulosic Materials Based on TG-FTIR, Py-GC/MS and 13 C NMR Experiments

Kinetic Study of the Thermochemical Degradation of Lignocellulosic Materials Based on TG-FTIR, Py-GC/MS and 13 C NMR Experiments

Aromatic Hydrocarbon Production from Eucalyptus urophylla Pyrolysis over Several Metal‐Modified ZSM‐5 Catalysts

Biomass Fast Pyrolysis for Hydrogen Production from Bio‐Oil

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