【摘要】 在温度403~433K,压力3.0～7.0MPa下,研究了以Pd/C为催化剂的松香催化加氢本征动力学,为工业反应过程的开发和操作提供了理论依据。通过减少催化剂粒度和提高搅拌转速,以消除内外扩散的影响,在松香加氢反应过程中,在线跟踪了反应物和产物浓度随反应时间的变化关系。根据实验数据,采用EVIEWS软件对10个可能的反应机理模型进行筛选,认为最可几的反应机理为:松香中的主要成分枞酸分子不吸附,枞酸分子与催化剂表面上被吸附的氢原子进行反应,氢原子的吸附为控制步骤;其反应动力学方程为:2SS(1)kPrbCaHH=+, 据此导出反应速率常数和吸附平衡常数分别为: aHk =5.695exp(-2498.5/T), bs =9.410-3exp(1920.8/T)。更多还原

【Abstract】 The intrinsic kinetics of catalytic hydrogenation of rosin using Pd/C catalyst was investigated at temperature range of 403K to 433K and under pressure range of 3.0MPa to 7.0Mpa. The effects of both internal and external diffusions were eliminated by reducing catalyst size and increasing stirrer rotational speed. The changes of concentration of reactants and products with reaction time were traced on-line during hydrogenation of rosin. Based on the experimental data, a suitable reaction mechanism was screened by EVIEWS software from 10 possible reaction mechanism models. The model indicated that the main component, abietic-acid, in rosin is not adsorbed, the reaction between atomically adsorbed hydrogen on catalyst surface and abietic-acid is the controlling step. The intrinsic kinetic equation can be written as: HH2SS(1)kPrbCa=+. The model parameters related with reaction rate and adsorption equilibrium were correlated from experimental data. The Arrhenius equations, i.e. H5.695exp(2498.5/)kTa=-, )/8.1920exp(104.93STb-=, can be used to describe the relationships between model parameters and reaction temperature. The model should be very useful to provide a theoretical explanation of reaction mechanism and to be applied in the development of industrial process.更多还原