Contributions to the Degenerated Branching Mechanism
of the Thermal Decomposition of Ammonia¹

L. Odochian^a, D. Dirtu^b, A. M. Mocanu^c, and C. Moldoveanu^a

^a “Al. I. Cuza’’ University, Faculty of Chemistry, Iassy, Romania

^b Regional Centre for Public Health, Iassy, Romania

^c “Gh. Asachi” University, Faculty of Chemical Engineering, Iassy, Romania

e-mail: lodochian@yahoo.com

Received July 1, 2010

Abstract—By continuing our studies on the reaction kinetics and mechanism of ammonia thermal decompo-
sition, new evidences are brought about supporting the indirectly branched chain mechanism advanced previ-
ously. The dependence of the induction period of the hydrogen formation as a reaction final product on the max-
imum concentration of hydrazine as the reaction molecular intermediate evidences indirectly branched chain
mechanism affording preponderantly the hydrogen formation from hydrazine. The branching factor value of
0.00136 s^–1 was found by means of three laws specific to the reaction developing according to three rules spe-
cific to the degenerated branching. This value indicates degenerated branching occurring rather as a scarce event
according to literature data where this factor is shown to be between 0.00016 and 0.01666 s^–1.

DOI: 10.1134/S0023158411040112

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