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Speciation of Sulfur in Biochar Produced from Pyrolysis and Gasification of Oak and Corn Stover

Identifieur interne : 004F11 ( Main/Exploration ); précédent : 004F10; suivant : 004F12

Speciation of Sulfur in Biochar Produced from Pyrolysis and Gasification of Oak and Corn Stover

Auteurs : SINGFOONG CHEAH [États-Unis] ; Shealyn C. Malone [États-Unis] ; Calvin J. Feik [États-Unis]

Source :

Environmental science & technology [ 0013-936X ] ; 2014.

RBID : Pascal:15-0040441

Descripteurs français

Pascal (Inist)
- Biomasse, Bois, Quercus, Maïs, Déchet végétal, Gazéification, Pyrolyse, Teneur soufre, Etude expérimentale, Traitement thermochimique, Condition opératoire, Température, Biochar.
Wicri :
- topic : Biomasse, Maïs.

English descriptors

KwdEn :
- Biochar, Biomass, Corn, Experimental study, Gasification, Operating conditions, Pyrolysis, Quercus, Sulfur content, Temperature, Thermochemical treatment, Vegetal waste, Wood.

Abstract

The effects of feedstock type and biomass conversion conditions on the speciation of sulfur in biochars are not well-known. In this study, the sulfur content and speciation in biochars generated from pyrolysis and gasification of oak and corn stover were determined. We found the primary determinant of the total sulfur content of biomass to be the feedstock from which the biochar is generated, with oak and corn stover biochars containing 160 and 600-800 ppm sulfur, respectively. In contrast, for sulfur speciation, we found the primary determinant to be the temperature combined with the thermochemical conversion method. The speciation of sulfur in biochars was determined using X-ray absorption near-edge structure (XANES), ASTM method D2492, and scanning electron microscopy- energy-dispersive spectroscopy (SEM-EDS). Biochars produced under pyrolysis conditions at 500-600 °C contain sulfate, organosulfur, and sulfide. In some cases, the sulfate contents are up to 77-100%. Biochars produced in gasification conditions at 850 °C contain 73-100% organosulfur. The increase of the organosulfur content as the temperature of biochar production increases suggests a similar sulfur transformation mechanism as that in coal, where inorganic sulfur reacts with hydrocarbon and/or H₂ to form organosulfur when the coal is heated. EDS mapping of a biochar produced from corn stover pyrolysis shows individual sulfur-containing mineral particles in addition to the sulfur that is distributed throughout the organic matrix.

Affiliations:

États-Unis

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Le document en format XML

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<front><div type="abstract" xml:lang="en">The effects of feedstock type and biomass conversion conditions on the speciation of sulfur in biochars are not well-known. In this study, the sulfur content and speciation in biochars generated from pyrolysis and gasification of oak and corn stover were determined. We found the primary determinant of the total sulfur content of biomass to be the feedstock from which the biochar is generated, with oak and corn stover biochars containing 160 and 600-800 ppm sulfur, respectively. In contrast, for sulfur speciation, we found the primary determinant to be the temperature combined with the thermochemical conversion method. The speciation of sulfur in biochars was determined using X-ray absorption near-edge structure (XANES), ASTM method D2492, and scanning electron microscopy- energy-dispersive spectroscopy (SEM-EDS). Biochars produced under pyrolysis conditions at 500-600 °C contain sulfate, organosulfur, and sulfide. In some cases, the sulfate contents are up to 77-100%. Biochars produced in gasification conditions at 850 °C contain 73-100% organosulfur. The increase of the organosulfur content as the temperature of biochar production increases suggests a similar sulfur transformation mechanism as that in coal, where inorganic sulfur reacts with hydrocarbon and/or H<sub>2</sub>
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Speciation of Sulfur in Biochar Produced from Pyrolysis and Gasification of Oak and Corn Stover

Speciation of Sulfur in Biochar Produced from Pyrolysis and Gasification of Oak and Corn Stover

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri