Experimental Determination Of Volatile Organic
Compounds Emitted By Thymus Vulgaris
Author(s)
K. Chetehouna, L. Courty, L. Lemée, J. P. Garo & P. Gillard
Abstract
Thymus vulgaris is a common Mediterranean vegetal species often involved in
forest fires. The aim of this work is to characterize the VOCs emitted by the
needles of this plant as functions of temperature. Experiments are performed
using a flash pyrolysis apparatus. The influence of two parameters, namely the
heating time and heating rate are studied: the highest VOCs’ emissions are found
for a heating time of 30 s at 5000 K/s. Two major compounds are identified for
all the temperatures, thymol and p-cymene. The total amount of VOCs emitted
increases with temperature and except for the three lowest temperatures, thymol
represents more than 50% of the gas mixture. Results are compared to literature
available data and to the emissions behaviour of other vegetal species.
Keywords: Thymus vulgaris, VOCs emission, flash pyrolysis, forest fires.
1 Introduction
Vegetation is the engine of combustion in forest fires and its characterization is
important to accurately modelling fires propagation. Before the pyrolysis
temperature, many Volatile Organic Compounds (VOCs) are emitted by most of
the vegetal species. These VOCs are mostly monoterpenes (C10H16) and
sesquiterpenes (C15H24) and they have very low values of lower flammability
limits, namely less than 1% vol. in air [1]. For this reason, they are much more
flammable than typical pyrolysis products (CO, CH4, etc.) and they should be
taken into account for the characterization of vegetation. We can find several
Keywords
Thymus vulgaris, VOCs emission, flash pyrolysis, forest fires.
Related Book
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