Fritz, B.; Lorenz, K.; Steinert, W.; Zellner, R.:
Rate of oxidation of hydrogen cyanide by hydroxyl radicals at lower temperatures.
1984
In: Oxidation Communications (Oxidation Commun.), Jg. 6 (1984), Heft 1-4, S. 363 - 370
Artikel/Aufsatz in Zeitschrift / Fach: Chemie
Titel:
Rate of oxidation of hydrogen cyanide by hydroxyl radicals at lower temperatures.
Autor(in):
Fritz, B.; Lorenz, K.; Steinert, W.; Zellner, R. im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr:
1984
Erschienen in:
Oxidation Communications (Oxidation Commun.), Jg. 6 (1984), Heft 1-4, S. 363 - 370
ISSN:

Abstract:

Rate consts. for the reaction OH + HCH -> products over an extended range of temps. and pressures were measured using a flash photolysis technique combined with resonance absorption for the detection of OH. The const. k1 increases with pressure at 20-500 mbar (N2 diluent) but shows little temp. dependence at 298-500 K. At the high-pressure limit, k1 can be represented by k1...(298-500 K) = (1.2 +- 0.5)[10-13 exp(-400/T) cm3/mol.s]. Above 500 K, a substantial increase in the apparent activation energy is obsd. The change of Arrhenius parameters is attributed to a change of mechanism from OH addn. at low temps. to dominant H abstraction or exchange at elevated temps.