Portal de Periódicos da CAPES

Temperature dependence of the CN radical reactions with C2H2 and C2H4

1986; Elsevier BV; Volume: 104; Issue: 2 Linguagem: Inglês

10.1016/0301-0104(86)80176-8

1873-4421

D. A. Lichtin, M. C. Lin,

Catalytic Processes in Materials Science

The temperature dependence of the reaction rates for CN radicals with C2H4 and C2H4 and C2H2 has been measured from room temperature to 700 K. The two laser photoionization/LIF-probe technique was used by photolyzing ICN at 266 nm and monitoring CN depletion via B ↔ X LIF at 388 nm. A resistively heated slow-flow gas reactor was employed at 50 Torr total pressure for the temperature dependence study. Both reactions were found to have rate constants that decreased with temperature, fitting kC2H4 = (4.72±0.25)×10−11exp[(509±20)/T] and kC2H2 = (3.49±10−11exp[(571±23)/T] cm3 molecule−1 s−1, indicating that both reactions occur by addition—elimination mechanism. No pressure dependence was observed within experimental errors.