Macroscopic Physical Properties Characterization of Molecular Sieve Catalysts:

Characterization of catalyst specific surface area and pore structure. 

There are many methods for determining the specific surface area, and the BET specific surface area test method is generally accepted 

as the standard method for measuring the specific surface area of solid catalysts.

Ji Dinghao et al. prepared a series of Cu/HZSM-5 catalysts with different Cu loadings by the impregnation method to investigate 

the effect of their catalytic performance on the dehydrogenation of hexanol, and the supported catalysts were characterized by the BET method.

It can be seen that the specific surface area of the HZSM-5 catalyst showed a decreasing trend with the increase of the active component Cu loading.

The main reason is that when the active component Cu is at a low loading content, it is mainly uniformly distributed on the surface of the HZSM-5 molecular sieve.

It has no great influence on the HZSM pores.

With the increase of the active component Cu loading content, it is no longer uniformly dispersed on the surface of the molecular sieve, 

but a large number of components are aggregated in the pores or channels, blocking the channels of the ZSM-5 molecular sieve, resulting in a decrease in small BET specific surface area