Determination of reaction kinetics of barley straw using thermogravimetric analysis
Identifieur interne : 004262 ( Main/Exploration ); précédent : 004261; suivant : 004263Determination of reaction kinetics of barley straw using thermogravimetric analysis
Auteurs : A. E. Ghaly [Canada] ; A. Ergüdenler [Canada]Source :
- Applied Biochemistry and Biotechnology [ 0273-2289 ] ; 1994-03-01.
Abstract
Abstract: Reaction kinetics of three varieties of barley straw (Kadeth, Laurier, and Leger) were studied at a heating rate of 20‡C/min in an oxidizing atmosphere of 15% oxygen and 85% nitrogen using thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques. The thermal degradation characteristics and the kinetic parameters (order of reaction, activation energy, and pre-exponential factor) were determined for the two reaction zones from the TGA and DTA curves. Thermal degradation rates in the first reaction zone were relatively higher than those in the second reaction zone. The thermal decomposition of the straw variety Kadeth started at a lower temperature (186‡C) than the straw varieties Laurier (229‡C) and Leger (223‡C). Residual weights recorded at 700‡C were in the range of 4.3–7.2%. Higher activation energies (85.4–103.2 kJ/mol) and pre-exponential factors (0.73 × 107–49.10 × 107) were obtained for all varieties of barley straw in the first reaction zone as compared to those of the second reaction zone (34.8–58.6 kj/mol and 0.27 × 102–14.43 × 102 for the activation energy and pre-exponential factor, respectively). The order of reactions were in the range of 2.0–2.3 and 1.1–1.2 for the first and second reaction zones, respectively.
Url:
DOI: 10.1007/BF02941786
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E." last="Ghaly">A. E. Ghaly</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Agricultural Engineering Department, Technical University of Nova Scotia, P.O. Box 1000, B3J 2X4, Halifax, Nova Scotia</wicri:regionArea><wicri:noRegion>Nova Scotia</wicri:noRegion></affiliation></author><author><name sortKey="Ergudenler, A" sort="Ergudenler, A" uniqKey="Ergudenler A" first="A." last="Ergüdenler">A. Ergüdenler</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Agricultural Engineering Department, Technical University of Nova Scotia, P.O. Box 1000, B3J 2X4, Halifax, Nova Scotia</wicri:regionArea><wicri:noRegion>Nova Scotia</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Applied Biochemistry and Biotechnology</title><title level="j" type="sub">Part A: Enzyme Engineering and Biotechnology</title><title level="j" type="abbrev">Appl Biochem Biotechnol</title><idno type="ISSN">0273-2289</idno><idno type="eISSN">1559-0291</idno><imprint><publisher>Humana Press</publisher><pubPlace>Totowa</pubPlace><date type="published" when="1994-03-01">1994-03-01</date><biblScope unit="volume">45-46</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="35">35</biblScope><biblScope unit="page" to="50">50</biblScope></imprint><idno type="ISSN">0273-2289</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0273-2289</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Reaction kinetics of three varieties of barley straw (Kadeth, Laurier, and Leger) were studied at a heating rate of 20‡C/min in an oxidizing atmosphere of 15% oxygen and 85% nitrogen using thermogravimetric analysis (TGA) and differential thermal analysis (DTA) techniques. The thermal degradation characteristics and the kinetic parameters (order of reaction, activation energy, and pre-exponential factor) were determined for the two reaction zones from the TGA and DTA curves. Thermal degradation rates in the first reaction zone were relatively higher than those in the second reaction zone. The thermal decomposition of the straw variety Kadeth started at a lower temperature (186‡C) than the straw varieties Laurier (229‡C) and Leger (223‡C). Residual weights recorded at 700‡C were in the range of 4.3–7.2%. Higher activation energies (85.4–103.2 kJ/mol) and pre-exponential factors (0.73 × 107–49.10 × 107) were obtained for all varieties of barley straw in the first reaction zone as compared to those of the second reaction zone (34.8–58.6 kj/mol and 0.27 × 102–14.43 × 102 for the activation energy and pre-exponential factor, respectively). The order of reactions were in the range of 2.0–2.3 and 1.1–1.2 for the first and second reaction zones, respectively.</div></front></TEI><affiliations><list><country><li>Canada</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Ghaly, A E" sort="Ghaly, A E" uniqKey="Ghaly A" first="A. E." last="Ghaly">A. E. Ghaly</name></noRegion><name sortKey="Ergudenler, A" sort="Ergudenler, A" uniqKey="Ergudenler A" first="A." last="Ergüdenler">A. Ergüdenler</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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