The transformations of ethylene sulfide were studied at three reaction temperatures (423, 473 and 523 K) on different acidic molecular sieves (HZSM-5, HY and AlMCM-41) and alumina in a pulse system. The main reaction pathways were found to be desulfurisation, cyclo-oligomerisation, the latter being more important. In this reaction channel mainly direct dimer (six-membered ring: 1,4-dithiane) and trimer (1,4,7-trithiacyclononane) formation occurred. The former product was always predominant, however, 1,4,7-trithiacyclononane was also significant, especially on molecular sieves with larger pore openings and alumina. At elevated temperatures 2-methyl-1,3-dithiolane (a five-membered cyclic molecule) was also detected. This molecule was formed in the highest amount on HZSM-5 among the catalysts applied revealing that a more constrained environment is advantageous for this dimerisation type to occur.