Abstract: This paper presents an approximate analytical method far calculating the isothermal effectiveness factors (nth order reaction) and nonisothermal effectiveness factors (1st order reaction) in spherical and cylindrical porous catalyst pellets. By introducing an equivalent reaction temperature andwith rational assumption, certain analytical correlations can be obtained. Complications in calculations involved in heterogeneous catalytic reaction, can thus be rendered much simpler. These correlations can be readily used to predict the isothermal and nonisothermal catalyst effectiveness factors with good accuracy. It is pointed out that such a concept of equivalent reaction temperature with the proposed approximation method will be very useful in catalytic reactor design and catalyst analysis.

摘要： 本文第一次提出了等效反应温度T_a的概念,即把一个等温n级反应或非等温一级反应等效为一个在T_a温度下进行的等温一级反应,从而大大简化了多孔催化剂有效系数的计算过程,并得到了等温和非等温催化剂有效系数的近似解析表达式.利用这些表达式来计算催化剂的有效系数,不仅简单易行,而且计算结果与用数值方法得出的结果相比,也较现有的近似计算方法更精确.