English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/2605
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

The influence of impregnation by hydrocarbons on coal structure during its thermal evolution

AuthorsIglesias, María José; Cuesta, María José; Laggoun-Défarge, Fatima; Suárez Ruiz, Isabel
Chemical structure
Physical structure
Coal structure
Perhydrous vitrinite
Thermal evolution
Issue Date2001
CitationJournal of Analytical and Applied Pyrolysis 58-59 (2001) 841-871.
AbstractThe present work analyses the changes in the chemical structure of a perhydrous coal during its thermal evolution at different temperatures in an open-medium pyrolysis system. The results obtained were compared with those described for non-perhydrous coals in order to establish the effect of the substances assimilated by the coal structure (hydrocarbon/oil-like substances) on the thermal evolution of the coal. The transformation ratio at each stage of thermal treatment was determined and the chemical-structural characterisation of the resultant products was performed. Changes in textural and microtextural properties associated with structural modifications during the evolution were also tested. The results obtained show that this perhydrous coal develops a specific evolution pathway different from that followed by non-perhydrous coals with a normal H/C ratio. The substances assimilated by the perhydrous coal cannot be easily and totally released from its structure so that they can be only partially removed after thermal treatment. Thus, the treatment debilitates the interactions between the substances and the coal matrix in addition to weakening and cracking the matrix during the thermal process. The increase in temperature also leads to the conversion of some of the heavy assimilated substances into lighter compounds. However, the assimilated substances are present even at high temperatures of the thermal process, providing hydrogen which has the effect of stabilising the radicals originated during the pyrolysis and improving the fluidity properties in the reacting medium.
Publisher version (URL)http://dx.doi.org/10.1016/S0165-2370(00)00181-9
Appears in Collections:(INCAR) Artículos
Files in This Item:
File Description SizeFormat 
Impregnation.pdf474,06 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.