NOVELTY - Power generating comprises: (i) providing a closed system; (ii) heating a dehydrogenation reactor to a first temperature; (iii) heating a fuel cell to a second temperature to form a liquid product mixture i.e. enriched in XH and to generate current; (iv) circulating the liquid product mixture i.e. enriched in X from the dehydrogenation reactor to a cathode; (v) circulating a gaseous product of the dehydrogenation reactor to an anode; and (vi) circulating the resulting liquid product mixture i.e. enriched in XH from the fuel cell to the dehydrogenation reactor.    USE - The method is useful for power generating from thermal energy in a thermally regenerative fuel cell (TRFC).    ADVANTAGE - The method is capable of effectively and easily converting waste heat into usable electrical energy inside a vehicle to supplement electrical energy available from batteries or an alternator, thus improving fuel efficiency and economy.    DETAILED DESCRIPTION - Power generating comprises: (i) providing a closed system comprising (a) a dehydrogenation reactor that holds a catalyst and a liquid that comprises XH and X, (b) a fuel cell that comprises a membrane electrode assembly that comprises an anode, a cathode, and a polymer electrolyte membrane in functional contact with both the anode and the cathode, and (c) means for circulating fluid between the dehydrogenation reactor and the fuel cell; (ii) heating the dehydrogenation reactor to a first temperature to form (a1) a gaseous product that comprises hydrogen and (b1) a liquid product mixture i.e. enriched in X; (iii) heating the fuel cell to a second temperature to form a liquid product mixture i.e. enriched in XH and to generate current, where the second temperature is substantially lower than the first temperature; (iv) circulating the liquid product mixture i.e. enriched in X from the dehydrogenation reactor to the cathode; (v) circulating the gaseous product of the dehydrogenation reactor to the anode; and (vi) circulating the resulting liquid product mixture i.e. enriched in XH from the fuel cell to the dehydrogenation reactor, where thermal energy is converted into electric energy via the dehydrogenation/hydrogenation and electric current is produced by the closed system, and the dehydrogenation/hydrogenation is reversible. INDEPENDENT CLAIMS are included for:    (1) a power generator comprising a housing, the dehydrogenation reactor, the fuel cell, and means for circulating dehydrogenation products from the dehydrogenation reactor to the fuel cell and for circulating hydrogenation products from the fuel cell to the dehydrogenation reactor, where the, power generator is a closed system, and when the dehydrogenation reactor is heated to a first temperature to form (a1) and (b1), and the fuel cell is heated to a second temperature to form a liquid product mixture i.e. enriched in XH and the first temperature is substantially higher than the second temperature, then thermal energy is converted into electric energy via reversible dehydrogenation/hydrogenation and electric current is produced; and    (2) dehydrogenating a secondary benzylic alcohol in a hydrogen-rich environment, comprising contacting a secondary benzylic alcohol with palladium on silicon dioxide in a closed hydrogen-rich environment at 200 degrees C.