Electrochemical methods for monitoring the volatile pyrolysis products of Pinus halepensis pine-needles

 
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Electrochemical methods for monitoring the volatile pyrolysis products of Pinus halepensis pine-needles (EN)

Gakis, D (EN)
Statheropoulos, M (EN)
Liodakis, S (EN)
Pappa, A (EN)
Tzamtzis, N (EN)

N/A (EN)

Various electrochemical methods such as oxidation-reduction potentiometry, pH-metry and conductometry were used for monitoring the volatile pyrolysis products of Pinus halepensis pine-needles. The study was carried out under non-isothermal conditions (ambient to 400 degrees C) with a heating rate of 10 degrees C min(-1), in nitrogen atmosphere. Products with the lowest redox potential values, such as aldehydes and alcohols, were evolved between 180 and 230 degrees C. Products with the highest conductivity values such as carboxylic acids, were evolved in the temperature range of 240-320 degrees C, whilst those with the lowest pH values, such as phenols and acids were evolved in the temperature range of 220-300 degrees C. The results of this study are in agreement with those obtained previously by DI-MS, Py-GC-FID and Py-GC-MS. The electrochemical methods have the advantage of being simple, fast and low cost methods for monitoring the pyrolysis products. The redox potential value is examined as a measure of the chemical stability (i.e. the reducing properties increase as the redox values decrease) correlated with the flammability of the pyrolysis products. (C) 1997 Elsevier Science B.V. (EN)

journalArticle

Pyrolysis (EN)
Plants (botany) (EN)
Heat treatment (EN)
Oxidation reduction potentiometry (EN)
Electrochemical methods (EN)
Carboxylic acids (EN)
Aldehydes (EN)
pH effects (EN)
Alcohols (EN)
Gas chromatography (EN)
Redox reactions (EN)
Thermal effects (EN)
Electrochemistry (EN)
Flammability (EN)
Pinus halepensis pine-needles (EN)
Mass spectrometry (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

Journal of Analytical and Applied Pyrolysis (EN)

1997


ELSEVIER SCIENCE BV (EN)



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