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首页> 外文期刊>Chemical Engineering Communications >MODELLING THE DEACTIVATION KINETICS OF CYCLOHEXANE DEHYDROGENATION ON PLATINUM/ALUMINA CATALYST
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MODELLING THE DEACTIVATION KINETICS OF CYCLOHEXANE DEHYDROGENATION ON PLATINUM/ALUMINA CATALYST

机译：铂/铝催化剂上环己烷加氢失活动力学的建模

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摘要

Two reaction deactivation kinetic models of the deactivation of cyclohexane on platinum/alumina catalyst have been proposed based on the coking mechanism of Corella and Asua and the reaction mechanism of Susu et at. The difference in the models was in the number of active sites participating in the coking reaction represented by h with h = 1 in model 1 and h ^ 1 in model 2. The models were dynamicmodels and parameter estimates were carried out by a method that did not require decoupling of the main from the coking reaction. The model formulation has made possible the estimation of the level of residual activity by the incorporation of a factor, f, that represents incomplete deactivation. For the deactivation kinetic data studied, a high value of f was obtained indicating a low residual activity. The models were found to give a good fit with the data. The standard deviation of the models from experimental were 10.21% for model 1 (h = 1) and 12.63% for model 2 (/1 J= 1). None of the models is superior to the other, though for having a lower standard deviation model 1 is better. It is therefore appropriate to propose that deactivation by coking in this work occurred preferably by a single site mechanism of the rate controlling step of the coking reaction.
机译：基于Corella和Asua的焦化机理和Susu等人的反应机理，提出了两种环己烷在铂/氧化铝催化剂上失活的反应失活动力学模型。模型之间的差异在于，模型1中的h = 1和模型2中的h ^ 1代表参与h的焦化反应的活性位点的数量。模型是动态模型，参数估计通过以下方法进行：不需要从焦化反应中分离出主反应。通过引入代表不完全失活的因子f，模型公式使得估算剩余活性水平成为可能。对于所研究的失活动力学数据，获得了较高的f值，表明其残留活性较低。发现这些模型与数据非常吻合。模型与实验的标准偏差对于模型1（h = 1）为10.21％，对于模型2（/ 1 J = 1）为12.63％。尽管具有较低标准偏差的模型1更好，但没有一个模型优于其他模型。因此，合适的是建议在该工作中通过焦化失活优选地通过焦化反应的速率控制步骤的单位机理来发生。

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