炭酸カドミウムの熱分解におよぼす雰囲気の影響

概要

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The kinetics of the isothermai decomposition of cadmium carbonate in the presence of gaseous He, N_2, O_2, and CO_2 (10, 380 and 760mmHg) have been studied in the temperature ranges 270o to 330o (He, N_2 and O_2) and 350℃ to 400℃ (CO_2). In general, the decomposition curves at 270℃ and 280℃ are given induction period, indicating an autocatalytic reaction, but over the temperature range of 290-330℃ the induction period was virtually absent and the final decay period more pronounced. The decomposition rate was Lowered in the presence of He, N_2, O_2 and especially CO_2 than in vacuum. The rate equation that described the entire range of the decomposition was not found. The rate was described by using different rate equation for different stages of the process. Best results were obtained with degree of decomposition in an initial reaction, acceleratory period and decay period α = kt^m, 1-(1-α)^ = kt, and -log(1-α) = kt respectively. The activation energies in these cases have been found to be larger value than in ordinary chemical reactions, and the combined results of these experiments gave the following activation energies (per mole) in an atmosphere of He, N_2, O_2 and CO_2 at a pressure of 380mmHg: (a) 73.2-83.4 and 250.2 kcal for the induction period; (b) 47.3-53.0 and 159.9 kcal for the acceleration: (c) 66.9-75.6 and 228.5 kcal respectively.
山形大学の論文
1969-03-20