Kinetics of methane pyrolysis under conditions of pyrolytic carbon formation

✍ Scribed by K.I. Makarov; V.K. Pechik

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 1024 KB
• Volume: 12
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(74)90004-9

✦ Synopsis

The influence of the contact tinle and the surface-to-volume ratio (S/l') in thr reaction zone on pyrolytic carbon formation was investigated during methane pyrol) sis in a flow system. The experiments were carried out within the temperature inter\ al of 815-llOO"C, the S/V ratio ranging from 1.5,'cm to IO'/cm. It was found that at S/V 5 IO"/cm the homogeneous reaction was depressed, and that the rate of pyrolytic carbon formation was proportional to the surface area.

At S/V <20/cm an autoaccelerating period of the reaction was observed. The steady rate of pyrolytic carbon formation related to the surface unit was independent of the S/V ratio under conditions 01 helerogeneous pyrolysis of methane, and was inverseI) proportional to the %L' ratio under conditions of homo-heterogeneous reacting. The I-ates obtained untle~. the lattr~. conditions were by a factor of lo'-10 greater than those obtained under heterogeneou\ pyrolysis. Results are analyzed on the basis of a kinetic, model which postulates ;I radic.al mechanism for both homogeneous and heterogeneous reactions and transition of r;cdic,als from the gas phase to the surface. The model i\ supported b) the litel-atur-c (lata.