Carbon films from carbon suboxide decomposition. Inhibition by carbon monoxide and the heat of formation of C2O

✍ Scribed by H.B Palmer; W.D Cross

• Publisher: Elsevier Science
• Year: 1966
• Tongue: English
• Weight: 689 KB
• Volume: 3
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(66)90033-9

✦ Synopsis

A theoretical analysis of carbon-deposition kinetics has been developed to take into account a back-reaction in a simple kinetic case and has been applied to experimental data for deposition from CsOs in the presence of CO. The analysis may serve as a prototype for the treatment of more complex systems. In the case of C,O,, experimental data on CO-inhibited deposition provide an approximate figure for the rate constant of the reaction, CsO + CO+CrOa, and this in turn has permitted the equilibrium constant at 1060°K to be determined for the reaction, CJOI(g)~C,,O+CO. An estimate of AS" for the reaction permits calculation of its AH" (+55 kcal) and the AHof of CaO (+ 58 kcal), with uncertainties of 2 or 3 kcal. The most interesting result of the work is its strong support for a sE state as the ground state of C,O together with the conclusion that the thermal decomposition of CsOs provides a further example to add to the short list of elementary reactions known to involve a change of spin. The transmission coefficient is found to be approximately 10-4.