| abstract |
An additional filter element of a filter device, in particular for reducing emissions of a tank ventilation system of a motor vehicle, is described, wherein the additional filter element is connected to a main activated carbon filter. The supplemental filter element comprises adsorbents having a high micropore volume to achieve high working capacity, particularly at 42 ° C, and a mesopore volume for retaining residual charge possibly present in the micropores. The micropore volume is at least 0.4 cm 3 / g and the mesopore volume is at most 0.95 cm 3 / g. |