Reactions of ozone with olefins: Ethylene, allene, 1,3-butadiene, and trans- 1,3-pentadiene

✍ Scribed by Abraha Bahta; R. Simonaitis; Julian Heicklen

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 764 KB
• Volume: 16
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550161006

✦ Synopsis

The reactions of 0, with ethylene, allene, 1,3-butadiene, and trans-1,3-pentadiene have been studied in the presence of excess 0, over the temperature range 232 to 298 K. The initial 0, pressure was varied from 4-18 mtorr, and the olefin pressure was varied from 0.1 to 4.5 torr (ethylene), 2.8 to 39.6 torr (allene), 52.7 to 600 mtorr (1,3butadiene) or 26.2 to 106 mtorr (trans-1,3-pentadiene). The 0, decay was monitored by ultraviolet absorption. The reactions are first order in both 0, and olefin, and the rate coefficients are independent of the 0, pressure. For the 0,-ethylene system, various diluent gases (02, N, , air) were used and the rate coefficients were found to be independent of the nature of the diluent gas. The various rate coefficients fit the Arrhenius expressions (k in cm3 s-'): For C,H,: k{232-298 K} = (7.72 2 0.89) x For C,H,: k{252-298 K} = (1.54 rt 0.25) x For 1,3-C4H,: k{254-299 K} = (2.20 ? 0.44) x For trans-1,3-C5H,: k{238-298 K} = (1.07 2 0.25) x lo-', exp[ -(4608 ? 122)RTl exp[-(5080 rt 60)/RT]