ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The initial rates of formation of the major products in the thermal reactions of ethylene at temperatures in the neighborhood of 750 K have been measured in the presence and absence of the additive butene-1. It has been shown that this ratio of rates is related to the ratio of rate constants for the two initiation processes: The ratio k′1/k1 has been measured over the temperature range of 700-773 K and may be expressed as (R = 1.987 cal/mol deg) log k′1k1(mol/L) = 2.8 - 4400/2.3RT. Assuming a value for k′1 of log k′1 (s-1) = 16 - 71,500/2.3RT, the value of k1 may be expressed as log k1(L/mol) = 13.2 - 67,000/2.3RT. The values for the frequency factor and activation energy for reaction (1) are discussed in relation to the heat of formation of the vinyl radical, and it is concluded that reaction (1) is the main initiation process in the thermal decomposition of ethylene under the present conditions.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/kin.550130913
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