Abstract
Changes in the porous structure of the pitch cokes with needle and mosaic structures and petroleum electrode coke after heat treatment in the temperature range from 1540 to 2880°C have been studied. It was found that the continuously increasing temperature dependences of total pore volume and outer volume of coke particles exhibit two local maxima in the regions of the most intensive release of sulfur, which are caused by the local increases of meso- and micropores. As the volume changes are permanent outside the maxima and transient in the position of the maxima, it is suggested that the development of porosity is produced by two mechanisms: an irreversible disconnection and gaping of the lamellar structure due to changes of crystallites, and a reversible deformation of the coke mass induced by formation of secondary meso- and micropores during expansion and escape of sulfur-containing gases.
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