« Previous AbstractYeast as a model system for mammalian seven-transmembrane segment receptors    Next AbstractThermogravimetric analysis and emission characteristics of two energy crops in air atmosphere: Arundo donax and Miscanthus giganthus »

Bioresour Technol

Title:		Pyrolysis characteristics and kinetics of Arundo donax using thermogravimetric analysis
Author(s):		Jeguirim M; Trouve G;
Address:		"Laboratoire Gestion des Risques, Mulhouse, France. mejdi.jeguirim@uha.fr"
Journal Title:		Bioresour Technol
Year:		2009
Volume:		20090411
Issue:		17
Page Number:		4026 - 4031
DOI:		10.1016/j.biortech.2009.03.033
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"The increase of the price of fossil means, as well as their programmed disappearing, contributed to increase among appliances based on biomass and energy crops. The thermal behavior of Arundo donax by thermogravimetric analysis was studied under inert atmosphere at heating rates ranging from 5 to 20 degrees C min(-1) from room temperature to 750 degrees C. Gaseous emissions as CO(2), CO and volatile organic compounds (VOC) were measured and global kinetic parameters were determined during pyrolysis with the study of the influence of the heating rate. The thermal process describes two main phases. The first phase named active zone, characterizes the degradation of hemicellulose and cellulose polymers. It started at low temperature (200 degrees C) comparatively to wood samples and was finished at 350 degrees C. The pyrolysis of the lignin polymer occurred during the second phase from 350 to 750 degrees C, named passive zone. Carbon oxides are emitted during the active zone whereas VOC are mainly formed during the passive zone. Mass losses, mass loss rates and emission factors were strongly affected by the variation of the heating rate in the active zone. It was found that the global pyrolysis of A. donax can be satisfactorily described using global independent reactions model for hemicellulose and cellulose in the active zone. The activation energy for hemicellulose was not affected by a variation of the heating rate with a value close to 110 kJ mol(-1) and presented a reaction order close to 0.5. An increase of the heating rate decreased the activation energy of the cellulose. However, a first reaction order was observed for cellulose decomposition. The experimental results and kinetic parameters may provide useful data for the design of pyrolytic processing system using A. donax as feedstock"
Keywords:		"Carbon Dioxide/analysis Carbon Monoxide/analysis Computer Simulation Kinetics Organic Chemicals/analysis Poaceae/*metabolism Polysaccharides/chemistry *Temperature Thermogravimetry Volatilization Waste Disposal, Fluid;"
Notes:		"MedlineJeguirim, Mejdi Trouve, Gwenaelle eng England 2009/04/14 Bioresour Technol. 2009 Sep; 100(17):4026-31. doi: 10.1016/j.biortech.2009.03.033. Epub 2009 Apr 11"