Abstract: Most kinetic studies of catalytic steam reforming of individual hydrocarbons have shown that the reaction products are carbon monoxide, carbon -dioxide, methane and hydrogen only, and the conversion rate equation of different hydrocarbons can be expressed in the same form but the rate constants are different. In addition, the water gas shift reaction is assumed to be at equilibrium in the reaction processes. In order to simulate catalytic steam reforming of naphtha, a relative reaction rate constant a, which is the ratio of the rate constant of species i to that of the reference species, was proposed. The value of a is used to distinguish a species from the others. When many hydrocarbons have the same value of a, they may be lumped as a psudospecies. Two continuous distribution functions D (a) and yo(a) were defined for naphtha. D(a) is called as species distribution function and y0(a) is the composition distribution function of naphtha. In this paper gamma distribution function was applied to represent D(a) and yo(a). The parameters of these distribution functions were estimated by use of the experimental results. If the activation energies of the hydrocarbons are the same, both D(a) and yo(a) do not depend upon the reaction temperature. The lumped kinetic model suggested fits with the experimental results satisfactorily.

摘要： 根据烃类水蒸气催化转化反应过程的动力学特性,提出了相对反应速率常数a的概念,以此为依据,定义了石脑油的物种分布函数D(a)及烃组成分布函数y_0(a).假定各种烃在反应过程中仅生成CH_4、CO、CO_2及H_2等产物,并且水煤气变换反应按达到平衡处理.利用这两个函数建立了石脑油水蒸气转化的连续集总动力学模型,能满意地模拟实验结果.