蜂窝催化剂上甲醇自热重整制氢的动力学研究

Global kinetics for hydrogen production by oxidative steam reforming of methanol over Zn-Cr/CeO2-ZrO2 catalyst was studied in a BSD-2A gradient-less reactor. The experimental conditions were chosen in the range of temperature 400 ℃～460 ℃, volume space velocity600 h－1~1 600 h－1, O2/CH3OH=0.1~0.25,H2O/CH3OH=1.0~1.8. Experiments were carried out by means of L16 (45) orthogonal design. Steam reforming of methanol, methanol decomposition and methanol total oxidation are treated as independent reactions. A power-type rate model was established, in which the rate of three independent reactions are related with the partial pressure of the reactants and products. Parameters of model were determined by the linear least-square parameter estimation method. The accuracy of the experimental data and kinetics model was proved by F-examination, which fit experimental data well. The activation energy of this study is similar to the models of the literatures. Remarkably, the kinetics of the difficult reaction -methanol total oxidation is also studied and the result is feasible. These kinetics results could then be used for the design and optimization of monolith reactor for hydrogen production.