Table 1 – Approximate correlation between molecular size and effective zeolite molecular sieve aperture (ref 2, 94)

Approx Size (ang)	Example	Window(no. of oxygens)	Molecules Accepted
<3.8	CaM, BaM	8, 12	He, Arm CO, H2O2, N2, NH3, H2O
<4.0	NaM, NaA	8	Kr, CH4, C2H6, CH3OH, CH3Cl, CO2, C2H2, CS2
<4.9	CaA, CaC	8	C3H8, n-C4H10, C2H5Cl, CH5OH, C2H5NH2, CHF2Cl, CHF3, CH3I, B2H6
<7.8	NaX	12	SF6, C4H10, C5H12, CHCl3, (CH3)2CHOH, n-C3F8, B5H9, CCl4, C2F2Cl4, C6H6, C6H5CH3, cyclopentane, cyclohexane, pyridine, dioxane, naphthalene, quionline
<10	CaX	12	1,3,5-Triethylbenzene

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