Surface ChemistryhardNUMERICAL

Zeolites possess the unique ability to act as shape-selective catalysts due exclusively to their micSurface Chemistry Chemistry Question

Question

Zeolites possess the unique ability to act as shape-selective catalysts due exclusively to their microporous, honeycomb-like $3D$ network structures. The functional pore size of these critical cavities generally varies within a highly specific range. What is the standard upper limit of the pore size of typical catalytic zeolites in picometers ($\text{pm}$)?

Answer: 740

💡 Solution & Explanation

The catalytic reactions occurring inside zeolites depend strictly upon the precise dimensions of their internal pores and cavities. Generally, the size of these pores is rigidly constrained between $260\text{ pm}$ and $740\text{ pm}$. Thus, only molecules small enough to enter and exit this $740\text{ pm}$ upper limit can participate in the reaction.

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