couldn't find anything regarding the reusing of the zeolite, however i do know that people that use amberlyst 15 catalytic beads (which i think work similarly to zeolite but i could be wrong) for their isomerization have to recharge the particles after each isomerization by using a dropping funnel with water and hydrochloric acid over a funnel that contains the catalytic beads and leave it to slowly drip on the beads in the spawn of a few hours.