铜基催化剂孔隙率对气体有效扩散系数的影响

Influence on Porosity of Cu - Based Catalyst to the Effective Diffusion Coefficients

研究了18种具有不同孔结构参数的粒状铜基甲醇合成催化剂孔隙率对有效扩散系数的影响。结果发现,催化剂微孔孔隙率增大,曲节因子亦增大,扩散阻力增加。将孔隙率与催化剂曲节因子关联,得到了半经验方程,用它可估算催化剂的曲节因子。

The influence of porosity of 18 kinds of Cu - based catalysts of methanol synthesis on the effective diffusion coefficients is studied. The catalysts have the different parameters of pore structure. The catalyst pore is divided into micro- pores of larger than10nm and less than 10nm. The study indicates that,the tortuosity factors increases while the porosity of micro pore increases which means the increase of the diffusion resistance. An empirical equation expressing the relationship between porosity and tortuosity is then obtained which can be used to estimate tortuosity in commercial practice.