The catalytic nature of co-crystalline molecular sieves is the key to improving catalytic performance

When synthesizing molecular sieves, multiple crystals are often formed in the same reaction system, which is the mixed crystal, co-growth or co-growth in the synthesis of molecular sieves.

Crystallization phenomena, such as common X/A, MFI/MEL, FAU/EMT and STF/SFF and other co-grown molecular sieves. Catalysis of some co-crystallized molecular sieves

The performance is also greatly improved. For example, when ZSM-5/ZSM-11 (MFI/MEL) co-crystal molecular sieve is used in MTG reaction, it can

A wide range of gasoline components can be adjusted . The catalytic nature of co-crystalline molecular sieves is actually the fine adjustment of pores and acidity, which is the key to improving catalytic performance.

Synthesis, characterization and catalytic performance of MCM-49/ZSM-35 co-crystallized molecular sieves in organic amine structure directing agent system.

Molecular sieves are structurally different from mechanically mixed molecular sieves. The catalytic cracking gasoline upgrading reaction results show that MCM-49/ZSM-35 co-crystallized

The sub-sieve is not a simple superposition of the two, but shows a stronger synergistic effect in the catalytic reaction, which is higher than that of the pure MCM-49 molecular sieve.

In addition, in the aromatization reaction of 1-butene, MCM-49 in the MCM-49/ZSM-35 co-crystal molecular sieve was combined with ZSM-35 also has a significant synergistic effect, 

and even a small amount of MCM-49 can show high aromatization performance 

The structure and acid properties of the sieve and the mechanical mixture of the two pure zeolites are obviously different. At present, there are not many studies on the co-crystallized zeolite.

There are still many problems to be studied in the specific research of structure, properties and catalytic performance.