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The effect of pore structure on the char‐steam reaction
Author(s) -
Chi WeiKuang,
Perlmutter Daniel D.
Publication year - 1989
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690351105
Subject(s) - char , porosity , pyrolytic carbon , chemistry , thermodynamics , chemical engineering , chemical kinetics , specific surface area , reaction rate , reaction rate constant , kinetics , materials science , pyrolysis , organic chemistry , catalysis , physics , quantum mechanics , engineering
Abstract The kinetics of the char‐steam gasification reaction and the accompanying pore structure changes have been investigated experimentally and interpreted through the use of the random pore model of Bhatia and Perlmutter (1980) and its extensions developed in this study. To allow model evaluations, surface areas and pore‐size distributions were obtained for various partially‐reacted char samples. Surface areas follow the reaction rates as a function of conversion, supporting the interpretation that the reaction of porous char with steam is governed by the structural changes that occur as conversion proceeds. Reaction rate constants were obtained from the kinetic data. A pyrolytic change of char mass was observed during the heatup period from room temperature to reaction temperature for each of the two char samples tested. This results in a significant increase in surface area and a decrease in pore structure parameter. It is shown that this pore structure parameter is very sensitive to changes in conversion when the initial parameter is large and the conversion is small.