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用内循环式无梯度反应器研究了正丁烷和水蒸汽在 Z409催化剂上的转化反应动力学。实验结果表明在实验条件范围内反应产物除氢、一氧化碳、二氧化碳及甲烷以外,不含其他烃类,而且水煤气变换反应始终接近热力学平衡。提出了该反应系统的反应模式。假定催化剂表面上存在两类活性位,且烃类的 C-C 键很快地断裂而生成单碳中间化合物,继而转变为碳-组分(即 CO,CO_2及 CH_4)。根据所提出的反应模式导出了各个反应的速率方程,与实验结果甚相符合。
The kinetics of the conversion reaction of n-butane and water vapor on Z409 catalyst was investigated with an internal recycle gradientless reactor. The experimental results show that the reaction products except the hydrogen, carbon monoxide, carbon dioxide and methane do not contain other hydrocarbons within the experimental conditions, and the water gas shift reaction always approaches the thermodynamic equilibrium. The reaction mode of the reaction system is proposed. It is assumed that there are two types of active sites on the surface of the catalyst, and the C-C bonds of hydrocarbons are rapidly broken to generate single-carbon intermediate compounds, which are then converted into carbon-components (ie CO, CO 2 and CH 4). According to the proposed reaction mode, the rate equation of each reaction is derived, which is in good agreement with the experimental results.