Rate constants for abstraction of hydrogen from ethylene by methyl and ethyl radicals relative to abstraction from propane and isobutane

✍ Scribed by S. I. Ahonkhai; X-H. Lin; M. H. Back

• Publisher: John Wiley and Sons
• Year: 1989
• Tongue: English
• Weight: 781 KB
• Volume: 21
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550210102

✦ Synopsis

A method is described for the measurement of relative rate constants for abstraction of hydrogen from ethylene at temperatures in the region of 750 K. The method is based on the effect of the addition of small quantities of propane and isobutane on the rates of formation of products in the thermal chain reactions of ethylene. On the assumption that methane and ethane are formed by the following reactions,

CzHs + 1' -C4H10 -CZH, + C4Hg measurements of the ratio of rates of formation of methane and ethane in the presence and absence of the additive gave the following results: log(k,/kz) = (-0.50 5 0.4) + (3200 r+_ 1000)/2.3T log(k,/k,) = (-0.20 2 0.4) + (2800 2 1000)/2.32' log(k11/kz) = (-0.97 5 0.4) + (4600 * 1000)/2.3T log(k12/k3) = (-2. 0 2 0.4) + (6300 2 1000)/2.3T Values for k 2 and k3 obtained from these ratios are compared with previous measurements.