Kinetics of graphitization—II. Pre-exponential factors

✍ Scribed by H.N. Murty; D.L. Biederman; E.A. Heintz

• Book ID: 102998015
• Publisher: Elsevier Science
• Year: 1969
• Tongue: English
• Weight: 469 KB
• Volume: 7
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(69)90523-5

✦ Synopsis

In the preceding article on kinetics of graphitization it has been demonstrated that for three typical cokes used industrially, the activation energy for graphitization is the same and is equal to 230 f 15 kcals/mol. However, in contrast to work done elsewhere, it is shown that systematic differences in respective rates of graphitization of various cokes, do become manifest and can be interpreted by focussing the attention on the 'structural envoronments' of calcined cokes themselves. It is shown that differences in the rate of graphitization of various cokes are due to differences in pre-exponential factor. The 'anisotropy' of calcined cokes which can be determined by X-ray methods is qualitatively correlated to the rate or ease of graphitization (pre-exponential factor); the rate of graphitization increasing with the 'anisotropy' of the calcined coke.