A range of small, medium and large pore zeolite, and their modified forms ave studied for their ability to separate di- from monobranched isomers of hexane. he separation studies are carried out using high-temperature (250-350 degrees C) gas chromatography. Beta(H,Ba) is found to be the most effective separator of 2,3-dimethylbutane and 3-methyl-pentane and is therefore studied for its sorption capacities toward the two hexane isomers.