Kinetic Model Discrimination for Toluene Hydrogenation over Noble-Metal-Supported Catalysts

详细信息    查看全文

• 作者：Pedro Casta&ntilde ; o ; José ; Marí ; a Arandes ; Bá ; rbara Pawelec ; Jose Luis G. Fierro ; Alazne Gutié ; rrez ; Javier Bilbao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：November 7, 2007
• 年：2007
• 卷：46
• 期：23
• 页码：7417 - 7425
• 全文大小：498K
• 年卷期：v.46,no.23(November 7, 2007)
• ISSN：1520-5045

文摘

The hydrogenation of toluene has been studied using an integral fixed-bed reactor with a Pt/-Al₂O₃ commercialcatalyst over a wide range of experimental conditions: temperature = 100-250 C, H₂ inlet pressure =0.3-1.9 bar, toluene inlet pressure = 0.04-0.15 bar, and space time = (2-10) × 10^-2 g_cat h g_tol^-1. Hydrocarbonmolecules block the active sites at elevated temperature and toluene partial pressure, and, as a consequence,three reaction-controlled regimes occur: (i) kinetic, (ii) surface coverage, and (iii) thermodynamic. Theexperimental data have been fitted to 23 kinetic models proposed in the literature (empirical and mechanistical),and their parameters have been estimated. The model discrimination has been performed based on statisticalF-test and mechanistical aspects. A simplified kinetics model is proposed by introducing the thermodynamicalequilibrium constant. Finally, that kinetic model is used for reactor simulation.