甲醇POSR制氢的反应网络热力学分析和有效因子的估算

在Cu/ZnO/Al2O3催化剂上对甲醇部分氧化蒸汽重整制备氢气反应的动力学过程进行了研究。在常压和473 K～1 073 K温度范围内对该反应网络中的甲醇部分氧化、甲醇蒸汽重整、甲醇分解和水煤气反应的化学平衡进行了分析。在对这些反应的催化剂Cu/ZnO/Al2O3动力学研究的基础上，根据有效因子的基本概念，考虑催化剂颗粒内的扩散限制，对每个反应沿反应器床层的有效因子进行了估算。

THERMODYNAMIC ANALYSIS AND ESTIMATION OF EFFECTIVE FACTORS FOR THE REACTION NETWORK OF HYDROGEN PRODUCTION FROM METHANOL POSR

Hydrogen production by partial oxidation steam reforming of methanol over a Cu/ZnO/Al 2O 3 catalyst has been paid more and more attention In order to optimize the operation conditions and improve the catalysts used in the methanol partial oxidation steam reform reaction, the mechanisms of the reaction in a tubular reactor are analyzed The heat effects, reaction equilibrium constants for different reactions in this system and equilibrium compositions at corresponding reaction temperatures are investigated By these analyses, thermodynamic competitive abilities for these reactions may be understood The kinetic expressions for partial oxidation of methanol, steam reforming of methanol, decomposition of methanol and water gas shift reaction are evaluated These kinetics can be used in the design of the reactor and the optimum of the operation conditions From the basic concept of the effectiveness factors, the intraparticle diffusion limitations were taken into account The effectiveness factor for each reaction along the bed length is calculated It describes the difference between the real reaction rate inside the catalyst pellets and the intrinsic reaction rate in the bulk phase along the reactor bed length in the reaction temperature range