Zeolite Theta-1 TON

Theta-1 has the same basic structure as as Mobil's ZSM-22 and it consists of straight pores running in one dimension with 10 oxygen atoms around the circumference of the pore (known as a 10-ring pore). Such a pore has a characteristic free aperture of about five Angstroms. Smaller pores (6-ring and less) also constitute the structure, but the free diameters of pores smaller than 8-rings do not allow molecules to pass, so they are not really considered "pores".

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