摘要
催化剂的宏观反应速率受颗粒内扩散过程的影响,而内扩散过程又取决于催化剂颗粒的孔结构。以铜基甲醇合成催化剂为研究体系,通过改变压片压强和共沉淀条件,制备具有不同孔结构参数(比表面、孔隙率、孔径分布、孔容、颗粒密度、曲折因子)的颗粒催化剂,由反应工程中的扩散-反应方程,按照平行交联孔模型计算有效扩散系数,模拟计算单颗粒催化剂在工业生产条件下的宏观反应速率,从而研究孔结构对未中毒铜基甲醇合成催化剂宏观反应速率的影响。
The pore structures of catalysts influence intraparticle diffusion which mainlydetermines the global reaction rate;Taking the Cu-based mathanol synthesis catalyst as theresearch object,catalysts with different pore structure parameters(specific surface area,porosity,pore volume,pore radius distribution,particle density and tortuosity factor)wereprepared by changing the catalyst’s pelleting pressure and coprecipitation condition. Diffu-sionreaction equations and parallel path cross-linked pore models were applied to model sin-gle pellet catalyst’s behavior and the global rection rate of methanol synthesis under commer-cial process conditions;The effects of pore structures on the global reaction rates were stud-ied for unpoisoned Cu- based methanol synthesis catalyst pellets.The following results wereobtained:(1)As the pelleting pressure increases,the global reaction rate on the catalyst pel-let decreases at first,and then increases,there is a minimum global reaction rate.(2)Thereis an optimum range of catalyst、orosity which corresponds to the maximum global reactionrate. (3)The effects of the parameters of the pore structure of the catalyst will interact,andthe total effect on the global reaction rates is the combination of the effect of each parameter.
出处
《燃料化学学报》
CSCD
北大核心
1994年第2期183-188,共6页
Journal of Fuel Chemistry and Technology
基金
高等学校博士学科点科研基金
关键词
铜基
甲醇
孔结构
金属催化剂
Cu-based catalyst
methanol
pore structure parameter
global reaction rate