1. The HZSM-5 molecular sieve catalyst has a good shape-selective catalytic effect on propane aromatization, so the content of benzene and toluene in the liquid phase product is higher than that of other components, and the content of non-aromatics is extremely low, which is easy to separate. However, the catalyst also has a high activity for the cracking reaction, which affects the composition and yield of aromatic hydrocarbons.
2. The zinc-modified ZSM-5 catalyst has more suitable acid strength and number of acid centers. It may be the reason for its high activity and high selectivity of aromatization, and it also improves the surface coking. Extended catalyst life.
3. On the surface of Zn-ZSM-5 catalyst, ZnO exists in the form of zincite (after activation). When the surface is reduced it will increase its electrical conductivity.

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