Arabczyk Walerian, Pelka Rafat
Szczecin University of Technology, Institute of Chemical and Environment Engineering, Szczecin, Poland.
J Phys Chem A. 2009 Jan 15;113(2):411-6. doi: 10.1021/jp8079759.
The reaction of ammonia decomposition and nitriding reaction as an example of the parallel reactions were studied. A surface reaction was assumed as the rate limiting step. The experiments were carried out in the range of temperatures from 623 to 723 K. Mixtures of different iron nitrides (gamma'-Fe(4)N, epsilon-Fe(3-2)N) were obtained. Differential tubular reactor with thermogravimetric (TG) measurement and analysis of the gas phase composition in the reaction volume was used. Reacting gases flowing through the reactor were mixed. Effective reactor volume was determined. The rate constants for ammonia decomposition and ammonia adsorption process at critical point between alpha-Fe and gamma'-Fe(4)N phases were estimated. The number of collisions and the sticking coefficient of ammonia over alpha-Fe phase were also assessed.
以氨分解反应和渗氮反应作为平行反应的实例进行了研究。假定表面反应为速率控制步骤。实验在623至723K的温度范围内进行。获得了不同铁氮化物（γ'-Fe(4)N、ε-Fe(3-2)N）的混合物。使用了带有热重（TG）测量以及对反应体积内气相组成进行分析的微分管式反应器。流经反应器的反应气体进行了混合。确定了有效反应器体积。估算了α-Fe与γ'-Fe(4)N相临界点处氨分解和氨吸附过程的速率常数。还评估了氨在α-Fe相上的碰撞次数和 sticking 系数。
