Deactivation model for textural effects of kinetics of gas-solid noncatalytic reactions “char gasification with CO2”

✍ Scribed by Nail Yaşyerli̇; Timur Doǧu; Gülşen Doǧu; i̇rfan Ar

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 434 KB
• Volume: 51
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(96)00104-2

✦ Synopsis

Variation of the reactivity of a solid reactant due to changes in number of working active sites and pore structure was represented by a deactivatiOn model. The model was shown to give good aggreeme~ with the experimental data obtained for the gasification of chars of different lignitas. All the kinetic data obtained at different temperatures (8000-9500C) and also for different type~ of coals were represented with a single generalized relatiotx The increase of the surface area of the char at the initial s~tges of gasification did not cause a corresponding increase in the reaction rate. Results indicated that the surface was composed of highly reactive end less reactive sites, it was shown that the reactivity of unit surface area of the solid reactant first showed a rapid decrease due to decrease of number of more reactive sites at the initial stages and then reached to about one fourth of its initial value.