Open AccessCharacterization of porosity via secondary reactions. Final technical report, 1 September 1991--30 November 1995
Author(s) -
J.M. Calo,
L. Zhang,
Peter Hall,
M.M. Antxustegi
Publication year - 1997
Language(s) - English
Resource type - Reports
DOI - 10.2172/591306
Subject(s) - porosity , microporous material , char , volume (thermodynamics) , specific surface area , materials science , characterization (materials science) , adsorption , chemical engineering , desorption , mineralogy , work (physics) , analytical chemistry (journal) , coal , chemistry , thermodynamics , composite material , nanotechnology , catalysis , physics , chromatography , organic chemistry , engineering
A new approach to the study of porosity and porosity development in coal chars during gasification was investigated. This approach involves the establishment of the relationships between the amount and type of surface complexes evolved during post-activation temperature programmed desorption (TPD), and the porosity, as measured by gas adsorption and small angle neutron scattering (SANS) techniques. With this new method, the total surface area and micropore volume can be determined by the interpretation of post-activation TPD spectra. The primary conclusion of this work is that it is possible to predict total surface area and micropore volume from TPD spectra. From the extended random pore model, additional information about the micropore surface area, the nonmicroporous surface area, and the mean micropore size development as a function of reaction time (or burn-off) can also be predicted. Therefore, combining the TPD technique and the extended random pore model provides a new method for the characterization of char porosity