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Title of article :
Oxidation characteristics of chars generated from wood impregnated with (NH4)2HPO4 and (NH4)2SO4
Author/Authors :
Carmen Branca، نويسنده , , Colomba Di Blasi، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2007
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Abstract :
Thermogravimetric analysis (heating rates between 5 and 15 K/min up to 873 K) has been carried out in air of chars, generated from the pyrolysis of wood and wood impregnated with (NH4)2HPO4 and (NH4)2SO4 (5%, dry wood basis) which are widely used as flame retardants. Salts significantly alter the char reactivity, but a mechanism consisting of three parallel reactions always provides a good description of the measurements. The estimated activation energy and reaction order of the most important combustion reaction, which causes the release of about 71–80% of the volatile matter, are nearly the same for untreated and (NH4)2SO4 impregnated samples (about 190–200 kJ/mol and 0.86). A lower activation energy (about 150 kJ/mol) and a higher reaction order (1.35) are obtained for (NH4)2HPO4 treatments. Scanning electronic microscope (SEM) images show significant modifications in the morphological structure of both wood and char as a consequence of salt impregnation.
Keywords :
Wood , Char reactivity , Flame retardants , Reaction mechanisms , Combustion
Journal title :
Thermochimica Acta
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