For TCE and PCE, variations are much more pronounced, with the computed selectivities spanning several orders of magnitude. TON, EUO, and MTW are most selective for TCE, with S(TCE/N2) on the order of 10 6 , whereas MOR and MFI are the best commercially available zeolites with selectivities of about 3•10 5 . PCE/N2 selectivities exceeding 10 7 are predicted for EUO, MTW, and MOR, followed by IFR. When looking at the pore system information listed in