期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 28, 期 1, 页码 73-80出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2008.01.006
关键词
tobacco stems; H3PO4; carbonization; pyrolysis; kinetics; kinetic compensation effect
In order to elucidate the mechanism of carbonization process of tobacco stems-based activated carbons with H3PO4-activation, the pyrolysis characteristics of plain tobacco stems and H3PO4 -impregnated tobacco stems were investigated through thermogravimetry (TG) at different heating rates (5, 15, 30 K/min) under nitrogen atmosphere. Based on TG curves, the kinetic parameters of the processes, including pre-exponential factors and activation energies, were calculated using the method of Coats-Redfern. The pyrolytic kinetic mode Is of plain tobacco stems and H3PO4-impregnated tobacco stems were set up. The main pyrolysis stage could be described by the first-order and 2.5-order global models for plain tobacco stems and H3PO4-impregnated tobacco stems, respectively. The results indicated that the activation energy of carbonization process of H3PO4 -impregnated tobacco stems was lower about 32.67-38.71 kJ mol(-1) than that of plain tobacco stems; furthermore, the kinetic parameters exhibited kinetic compensation effects. (c) 2008 Elsevier B.V All rights reserved.
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