The conversion of ethanolamine to industrially important diazabicyclo [2.2.2] octane (DABCO) has been studied over the ZSM-5 zeolite. This transformation takes place via the piperazine route. With the increase in reaction temperature from 325 to 400 degrees C, ethanolamine conversion increased from 4.5 to 82%, while the DABCO selectivity decreased from 71 to 47%. The catalyst stability is lower at higher ethanolamine conversion, while it improves at lower ethanolamine conversion.