When going from the C2 to the C3 hydrocarbons the TPV for propane is 2.30 cm 3 •g -1 and reduces by 42 % to 1.33 cm 3 •g -1 which is very similar to the values for ethylene. A fourth adsorption/desorption cycle was measured thus the pore volume in the third cycle differed significantly from that in the second. For propylene the TPV in the first cycle is 1.35 cm 3 •g -1 with a 49 % decrease to 0.69 cm 3 •g -1 after four cycles. Again, these values are very similar to those for n-butane where a TPV of 1.33 cm 3 •g -1 with a 45 % decrease to 0.73 cm 3 •g -1 is observed. The similarity in TPV for the pairs ethylene/propane and propylene/n-butane is noticeable and may be explained by increasing Van-der-Waals interactions with compensating the lack of π-π interactions and vice versa. For 1,3-butadiene we observe the lowest total pore volume of 0.99 cm 3 •g -1 and a decrease to 0.46 cm 3 •g -1 after four cycles.