NOVELTY - Releasing hydrogen gas from a 5-7C alkane thiol, comprises: (a) providing a 5-7C alkane thiol in a gaseous phase; (b) exposing gaseous alkane thiol to a first catalyst surface at 150-300 degrees C to form a five-membered cyclic thioether substituted with 1-2 methyl or ethyl groups and at least one mole of diatomic hydrogen gas; and (c) exposing the cyclic thioether to a second catalyst surface at 130-400 degrees C to form a thiophene and two more moles of diatomic hydrogen gas.    USE - The process is useful for releasing hydrogen gas from a 5-7C alkane thiol.    ADVANTAGE - The process is easily reversible, and has rapid reaction rates with minimal side reactions. The process provides the tetrahydrothiophene at relatively high yields and low reaction temperatures.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) delivery of hydrogen from an organic compound capable of reversible hydrogenation/dehydrogenation (where the organic compound is initially in its hydrogenated form and subsequently catalytically dehydrogenated under dehydrogenation conditions in a reactor forming hydrogen and byproduct dehydrogenated organic compound), comprising: introducing the organic compound capable of reversible hydrogenation/dehydrogenation in liquid form to a microchannel reactor incorporating a dehydrogenation catalyst; vaporizing the organic compound in a vaporizer; effecting dehydrogenation of the organic compound; recovering a reaction product comprised of a byproduct dehydrogenated organic compound and gaseous hydrogen; and separating and recovering the reaction product comprised of the dehydrogenated organic compound and gaseous hydrogen into a gaseous hydrogen fraction and liquid phase byproduct dehydrogenated organic compound; and    (2) a reactor for dehydrogenating a liquid organic material within a gaseous state, comprising: a vaporizer to convert the liquid organic material to a gaseous state having an inlet for the liquid organic material and an outlet; a microchannel reactor incorporating a dehydrogenation catalyst and having an inlet communicating with outlet of the vaporizer and an outlet; and a condenser/separator to condense gaseous dehydrogenated or partially dehydrogenated liquid organic material or hydrogenated liquid organic material into a liquid and release hydrogen gas, and having an inlet communicating with the outlet of the microchannel reactor and having two outlets, one for liquid materials and the other for gaseous hydrogen.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the reactor.