REY series zeolite has the property of shape-selective catalysis
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Because there are uniform small internal pores in the REY series zeolite structure, when the molecular dimensions of the reactants and products are close to the pore diameter in the crystal, the selectivity of the catalytic reaction often depends on the corresponding size of the molecule and the pore diameter. This selectivity is called shape-selective catalysis. There are two mechanisms leading to shape selectivity, one is caused by the difference in the diffusion coefficient of molecules participating in the reaction in the cavity, which is called mass transfer selectivity; the other is caused by the space limitation of the transition state of the catalytic reaction, called transition state selectivity.
When some reactive molecules in the reaction mixture are too large to diffuse into the pores of the catalyst, only those molecules whose diameter is smaller than the diameter of the inner pores can enter the inner pores and react in the catalytically active part.
Product shape selectivity occurs when some molecules in the product mixture are too large to diffuse out of the inner pore windows of the REY series zeolite catalyst.
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