水蒸気によるm-キシレンの接触的脱アルキル基反応における液生成物への転化率と液生成物組成の関係

抄録

A Kinetic study on the steam-dealkylation of m-xylene over the Ni-BeO catalyst was carried out and the experimental initial rate equations for both benzene formation and toluene formation were determined at the reaction temperature of 360°C. The initial rate (V₃⁰) of benzene formation obeyed the equation V₃⁰=k₃. Similarly, the initial rate (V₁⁰) of toluene formation obeyed the equation V₁⁰=k₁. A surface bimolecular reaction mechanism in which a hydrocarbon molecule adsorbed on A site (a site which strongly adsorbs m-xylene) reacts with a water molecule adsorbed on B site (a site which strongly adsorbs water) well explains the experimental rate equations.
The extended application of the kinetic treatments based on this reaction mechanism gave an equation which expresses the relation between the benzene content (Y) in the liquid products and the conversion (X) of m-xylene to the liquid products. This equation was found to have an extensive applicability; namely, the X-Y relations not only for the Ni-BeO catalyst but also for the other catalysts (Ni-Cr₂O₃-I, Ni-Cr₂O₃-II) were easily explained by the appication of this equation.