Characterization of chars from pyrolysis of lignin

Sharma, Ramesh K.; Wooten, Jan B.; Baliga, Vicki L; Lin, Xin; Chan, W. Geoffrey; Hajaligol, Mohammad R.

doi:10.1016/j.fuel.2003.11.015

Cited by 831 publications

(569 citation statements)

References 28 publications

Supporting

Mentioning

507

Contrasting

Unclassified

Order By: Relevance

“…13 C NMR spectra of pine Kraft lignin (PKL) and the lignin after torrefaction at 300°C for 1 hour using a heating rate of 3°C/min (TL). Peak assignments adapted from Sharma et al [23]. Fig.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

Castro-Dı́az

Uguna

Florentino

et al. 2017

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Hydrochars were obtained after hydrous pyrolysis of a pine Kraft lignin using different reaction conditions (temperature, water content and residence time) and the residues were characterized through a wide range of analytical techniques including high-temperature rheometry, solid-state 13 C nuclear magnetic resonance (NMR), thermal gravimetric analysis (TGA), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and field emission scanning electron microscopy (FE-SEM). The results indicated that an increase in reaction temperature, an increase in residence time or a decrease in water content reduces the amount of fluid material in the residue. The hydrous pyrolysis conditions studied were not able to increase the maturation of lignin, which would result in an increase in the resolidification temperature, but reduced the amount of mineral matter in the hydrochar produced. On the other hand, the hydrochars obtained from pristine lignin, torrefied lignin (300°C, 1 hour) and their 50:50 wt.%/wt.% blend at temperatures of 350°C after 6 hours using 30 ml of water had lower ash contents (<2 wt.%) than the parent lignin (2.5 wt.%) and a high rank good coking coal (10 wt.%). However, the reactivity of the resulting biocokes (>45%) is excessively high compared to that of the good coking coal (10%) and the microstrength of the biocokes (R 1 <1%) is much lower than that of the coal (R 1 =17%). These findings could be rationalized by the high total porosity (>39%) and high microporous surface areas (>400 m 2 /g) of the biocokes and high alkalinity index of the lignins (>27%) compared to those of the coke (27% and 145 m 2 /g) and coal (0.6%), respectively. Furthermore, the biocoke derived from the hydrous pyrolysed torrefied lignin did not agglomerate, which could not be explained by changes in the chemical properties of the material and requires further investigation.

show abstract

Section: Discussionmentioning

confidence: 99%

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

Castro-Dı́az

Uguna

Florentino

et al. 2017

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

show abstract

“…The chemical structures of the pyrolysis products of lignins have been evaluated by gas chromatography/mass spectrometry (GC/MS) [10][11][12], nuclear magnetic resonance (NMR) [12][13][14][15][16][17][18] and infrared (IR) spectroscopic [15,[19][20][21] analyses, along with pyrolysis directly coupled with GC/MS [22][23][24][25][26][27][28][29][30][31][32][33][34][35] and IR [19,[36][37][38][39] (Py-GC/MS, Py-IR). Aromatic methoxy groups are stable during the primary pyrolysis stage and become very reactive in the temperature range of 400-450 °C.…”

Section: Effect Of Temperature On Pyrolysis Productsmentioning

confidence: 99%

Lignin pyrolysis reactions

2017

View full text Add to dashboard Cite

“…It is also noted in those same curves (Figure 1), two degradation peaks at around 290°C and 360°C, which temperatures cause the decomposition of cellulose and hemicellulose. Lignin remains in this temperature range because its decomposition generally starts from 370 ºC 43,44,45 . TGA analyzes were also performed to verify the thermal events of the analyzed fibers.…”

Section: Dsc Of the Fibers And Polymeric Matrixmentioning

confidence: 99%

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

et al. 2016

View full text Add to dashboard Cite

Biodegradable polymeric composites using natural fibers have been investigated aiming to mitigate environmental impacts. In this paper, polyhydroxybutyrate (PHB) composites obtained using random mats of sisal and coconut fibers by compression molding in a hydraulic press, and the fiber content varied between 10% and 15% relative to the weight of the polymer. Thermal analyses were performed such as Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). Flexural and tensile tests were performed before and after conditioning in climate chamber with temperature and moisture. The results of thermal analysis show that the thermal stability of the materials remained, both PHB without fiber as for composites with natural fibers mats. The results of mechanical tests indicated that the PHB without fibers and composites showed similar flexural strength values, while the results of the tensile test PHB without fibers showed resistance to higher tensile composite.

show abstract

Characterization of chars from pyrolysis of lignin

Cited by 831 publications

References 28 publications

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

Evaluation of hydrochars from lignin hydrous pyrolysis to produce biocokes after carbonization

Lignin pyrolysis reactions

Polyhydroxybutyrate Composites with Random Mats of Sisal and Coconut Fibers

Contact Info

Product

Resources

About