合成氨反应动力学平衡常数与热力学平衡常数的关系

Discussion on the Relationship Between the Kinetic and Thermodynamic Equilibrium Constants of Ammonia Synthesis

根据当前普遍被接受的氨合成和氨分解机理,明确了氨合成及分解反应的速度控制步骤,确定了氨合成和氨分解反应的动力学方程,进而导出合成氨反应的动力学平衡常数表达式,与热力学平衡常数进行了比较,明确了2者之间的关系。有助于理解合成氨热力学平衡常数与反应速率的关系。

According to the currently accepted mechanisms of synthesis and decomposition of ammonia, the rate-determining step of the forward and reverse reaction is discussed. Then, the rate equations of synthesis and decomposition of ammonia is formulated based on which the kinetic equilibrium constants are postulated. The comparison between the kinetic and thermodynamic expressions of equilibrium constant is made. It is helpful for the students to correctly understand the relationship between thermodynamic equilibrium constant and reaction rate of ammonia synthesis.