A systematic study of the kinetics of lignin pyrolysis

Jiang, Guozhan; Nowakowski, Daniel J.; Bridgwater, Anthony V.

doi:10.1016/j.tca.2009.10.003

Cited by 306 publications

(165 citation statements)

References 29 publications

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“…E. prolifera is primarily devolatilized between 209 and 490 ı C and the maximum weight loss occurred beginning with 255 ı C, which is lower than the temperature for lignocellulase materials (Jiang et al, 2010). Furthermore, the activation energy of E. prolifera during the devolatilization stage was lower.…”

Section: Discussionmentioning

confidence: 93%

“…This research objective was to obtain the macroalgal kinetic parameters of the thermal decomposition via the Flynn-Wall-Ozawa (FWO) method and double extrapolation method, and to determine the macroalgal thermal degradation mechanism by comparing the value of activation energy E calculated by the two methods according to the most frequently used 22 mechanism functions of solid processes. The results may provide useful information for designing a pyrolytic processing system using macroalgal biomass as feedstock (Jiang et al, 2010;Li et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Pyrolysis Characteristics and Kinetics of the Marine MacroalgaeEnteromorpha proliferaUsing a Thermogravimetric Analyzer

Zhao¹,

Yan²,

Liu³

et al. 2012

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The Pyrolysis Characteristics and Kinetics of the Marine MacroalgaeEnteromorpha proliferaUsing a Thermogravimetric Analyzer

Zhao¹,

Yan²,

Liu³

et al. 2012

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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“…Depending on the extraction method used and original source the physicalchemical characteristics differ considerably 2,3 . Various methods have been developed to separate lignin from the other constituents of the lignocellulosic materials [1][2][3][4] . Since each separation method modifies to some degree the chemical structure of the naturally occurring lignin, so lignin is conventionally named after the method of separation used.…”

Section: Introductionmentioning

confidence: 99%

“…Since each separation method modifies to some degree the chemical structure of the naturally occurring lignin, so lignin is conventionally named after the method of separation used. The Klason method is one of the most typical lignin determination procedures 4,5 . The method separates lignin as an insoluble material by depolymerization of cellulose and hemicellulose in 72% sulfuric acid followed by hydrolysis of the dissolved polysaccharides in boiling 3% sulfuric acid 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Materials produced from plant biomass: part III: degradation kinetics and hydrogen bonding in lignin

Poletto

Zattera

2013

Mat. Res.

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In this study Klason lignins from Eucalyptus grandis (LEUG) and Pinus taeda (LPIT) were characterized using Fourier transform infrared (FTIR) spectroscopy and thermogravimetry (TGA). The degradation kinetic parameters were determined by TGA using the Kissinger method. Thermogravimetric results showed that LPIT had higher thermal stability and also higher activation energy than LEUG. FTIR results showed that the average strength of intermolecular interactions and enthalpy of hydrogen bond formation among the phenolic groups are higher for LPIT than for LEUG. The results demonstrated that differences between thermal stability and degradation mechanisms might be associated with differences in hydrogen bonding in lignin.

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“…15 Lignin extractives are mainly classified into two different categories based on the separation methods. 16 One is the lignin extracted by its dissolution in solvent and the other is the lignin residue obtained after removal of sugar components by hydrolysis. In the former method, lignin linkages are broken by strong acid, 17,18 base catalysts 19 or mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and reaction chemistry for slow pyrolysis of enzymatic hydrolysislignin and organosolv extracted lignin derived from maplewood

et al. 2012

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The kinetics and reaction chemistry for the pyrolysis of Maplewood lignin were investigated using both a pyroprobe reactor and a thermogravimetric analyser mass spectrometry (TGA-MS). Lignin residue after enzymatic hydrolysis and organosolv lignin derived from Maplewood were used to measure the kinetic behaviours of lignin pyrolysis and to analyse pyrolysis product distributions. The enzymatic lignin residue pyrolyzed at lower temperature than that of organosolv lignin. The differential thermogravimetric (DTG) peaks for pyrolysis of the enzymatic residue were more similar to the DTG peaks for pyrolysis of the original Maplewood than DTG of the organosolv lignin. The condensable liquid volatile products were collected from a Pyroprobe reactor with a liquid nitrogen trap. The primary monomeric phenolic compounds were guaiacol, syringol, and vanillic acid. However, only 14-36 carbon% of the sample could be detected by GC-MS. Over 60 carbon% of the condensable products were heavy tar molecules that are not detectable by GC-MS. These heavy tar molecules are the primary products from pyrolysis of lignin. Intermediate solid samples were also collected at various pyrolysis temperatures and characterized by elemental analysis, FT-IR, DP-MAS 13 C NMR, and TOC. The methoxy groups and ether linkages decreased and the non-protonated aromatic carbon-carbon bonds increased in the solid residues as the pyrolysis temperature increased. The carbon content of the initial lignin feed (derived from enzymatic hydrolysis) and the solid polyaromatics residue (obtained at 773 K) was 58 wt% and 74 wt% respectively. This polyaromatic residue contained about 69 wt% of the original lignin feed. The solid polyaromatics undergo further slow decomposition accompanied by a constant release of carbon dioxide as the pyrolysis reaction continues. The pyrolysis of the enzymatic lignin residue was modelled by two reactions in series. In the first pyrolysis step the lignin was decomposed with an apparent activation energy of 74 kJ mol -1 and a heat of reaction of -8,780 kJ kg -1 . The second pyrolysis step had an apparent activation energy of 110 kJ mol -1 and a heat of reaction of -2,819 kJ kg -1 . Lignin pyrolysis has lower activation energies and higher heats of reaction than cellulose pyrolysis.

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A systematic study of the kinetics of lignin pyrolysis

Cited by 306 publications

References 29 publications

The Pyrolysis Characteristics and Kinetics of the Marine MacroalgaeEnteromorpha proliferaUsing a Thermogravimetric Analyzer

The Pyrolysis Characteristics and Kinetics of the Marine MacroalgaeEnteromorpha proliferaUsing a Thermogravimetric Analyzer

Materials produced from plant biomass: part III: degradation kinetics and hydrogen bonding in lignin

Kinetics and reaction chemistry for slow pyrolysis of enzymatic hydrolysislignin and organosolv extracted lignin derived from maplewood

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