As shown in the previous section, the CE/N2 selectivities in the limit of zero coverage become very large for large CEs like TCE and PCE. However, as the target application is the removal of trace amounts, rather than bulk separation, these numbers give only limited insights into the potential usefulness of different zeolite frameworks for CE removal. In this regard, the uptake at low CE concentrations (= low fugacities) under ambient conditions is more relevant. To address this, adsorption isotherm simulations were performed for ETH and all CEs for a fugacity range from 10 -5 to 1 kPa. In addition to computing single-component adsorption isotherms, simulations of VC/N2, TCE/N2, and PCE/N2 co-adsorption were carried out, in which the fugacity of N2 was set to 101.325 kPa. Assuming ideal gas behavior, the partial pressures of the CEs in these mixtures correspond to concentrations ranging from 0.1 ppm to 10,000 ppm (1 vol%). Full adsorption isotherms are shown in Tables The first thing that is worth noting when looking at the two figures is the close match of CE As shown in Figure , EUO and IFR, followed by TON and MFI, take up the largest amounts of VC at 10 -5 and 10 -3 kPa. Even for these frameworks, however, the adsorbed amounts are very small, on the order of 10 -5 and 10 -3 mmol g -1 , respectively, at the two pressures. This indicates that none of the zeolites is particularly attractive for the removal of VC in the ppm range. At 1 kPa, most of the zeolites adsorb significant amounts of VC, with the uptake of IFR exceeding 1 mmol g -1 . However, such a high concentration of 1 mol% is not relevant for the removal of trace amounts. Compared to VC, the uptakes of TCE and PCE computed for low pressures (Figure ) are much higher. Although the trends for the two species are similar, the uptakes at 10 -5 kPa are about one order of magnitude larger for PCE due to stronger host-guest interactions. EUO and MTW are predicted to adsorb the largest amounts of TCE and PCE this pressure and should thus be best suited for their removal in the sub-ppm range. Among the commercially available zeolites, MFI has the most beneficial properties for TCE removal, whereas MOR should perform better in PCE removal. At a pressure of 10 -3 kPa, IFR exhibits the highest uptakes of both gases, which amount to 1.0 and 1.7 mmol g -1 for TCE and PCE, respectively. EUO constitutes the second-best adsorbent for TCE, whereas the commercially available BEA adsorbs almost as much PCE as IFR. The volume concentration of 10 ppm in the CE/N2 mixture is on the same order of magnitude as typical long-term exposure limits, indicating that these zeolites could find use for removal of traces of these contaminants, e.g., in a workplace context or in the treatment of exhaust gases. At 1 kPa, the amounts adsorbed in the different zeolites show a similar pattern for TCE and PCE. With few exceptions, the uptakes are well correlated with the accessible pore volume Vacc, indicating a complete filling of the pores by the guest molecules. This is corroborated by the adsorption isotherms visualized in the supplementary EXCEL file, which show that saturation is essentially reached for all zeolites at 1 kPa, and, in many cases, at much lower pressures. For example, the PCE uptakes of EUO/IFR at 1 kPa are only 4%/10% higher than the respective uptakes at 10 -3 kPa.