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本文对金属催化剂活性中心性质提出了新的表征方法,即用活性频率量度活性中心的强度,用原子组合数的概念描述原子组成活性中心的方式,在此基础上提出了活性频率和活性中心原子组合数的计算公式与新的测定方法。 从测出的活性频率和活性中心原于组合数的数据,发现了Pt-Al_2O_3催化剂具有两种活性中心即α和β中心。α中心CS_2的吸附能力比β中心强,但β中心对环己烷的脱氢活性比α中心强。同时证明了不管在α中心或在β中心上环己烷的脱氢反应都是在双位中心上进行的。 本文还考察了锡和铼对铂催化剂性能的影响,实验表明锡和铼都能从结构效应和电子效应方面影响铂的催化性能。
In this paper, we proposed a new characterization method for the activity centers of metal catalysts, that is, the activity frequency is used to measure the intensity of the active center and the atom composition number is used to describe the active center of atoms. On the basis of this, the active frequency and active center atom The Calculation Formula of Combination Number and New Measurement Method. From the measured activity frequency and the active center from the data of the number of combinations, it was found that the Pt-Al 2 O 3 catalyst has two kinds of active centers, α and β centers. The adsorption capacity of α-center CS_2 is stronger than that of β-center, but the activity of β-center for cyclohexane dehydrogenation is stronger than α-center. At the same time, it was proved that the dehydrogenation of cyclohexane in the center of α or in the center of β all took place at the center of the double bond. The effect of tin and rhenium on the performance of platinum catalyst was also investigated. The experiments show that both tin and rhenium can affect the catalytic performance of platinum from the aspects of structure effect and electronic effect.