There has been a great concern on hydrogen as a clean secondary energy for fuel-cell driven cars etc. To the gas station, hydrogen should be transported in safety. For this purpose, liquid chemical carriers such as cyclohexane, dekalin, methyl cyclohexane, methanol etc. are promising candidates for hydrogen storage & transmission because those are liquid at an ordinary temperature and have higher hydrogen content (ca.7 wt%). We have demonstrated that a highly efficient hydrogen production is possible using a palladium membrane reactor, where a hydrogen recovery exceeding 90% is obtained.