TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The second component provides at least part of the heat required for an endothermic catalytic dehydrogenation of the composition that is sufficient to release hydrogen. The composition comprises at least one member selected from a single molecule that is capable of reversible hydrogenation and oxidation, at least two molecules where one of the molecules can undergo reversible catalytic hydrogenation and dehydrogenation, and/or another molecule that can undergo selective oxidation.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The composition comprises at least one oxidizable molecule and an oxidized molecule selected from toluene to benzyl alcohol; toluene to benzaldehyde; toluene to benzoic acid; diphenylmethane to benzophenone; benzyl alcohol to benzaldehyde; benzyl alcohol to benzoic acid; ethanol to acetaldehyde; isopropanol to acetone; 1-phenyl, 1-hydroxyethane to acetophenone; ethylamine to acetonitrile; trimethylamine to dimethylformamide; dimethyl sulfide to dimethylsulfoxide or dimethyl sulfoxide to dimethyl sulfone. The composition comprises a molecule having oxidizable groups and oxidation products selected from activated hydrocarbon groups that are selectively oxidized to a hydroxymethylene, -CH2OH group; to a formyl, -C(O)H; carboxyl -COOH; keto -C(O)- or aromatic group; primary alcohol groups that are selectively oxidized to a formyl or to a carboxyl group; secondary alcohol groups that are selectively oxidized to form a keto group; primary amine groups that are selectively oxidized to a nitrile; cyclic secondary amine groups that are selectively oxidized to an N-heterocyclic aromatic; an N-methylamine that is selectively oxidized to a formamide; a sulfide that is selectively oxidized to a sulfoxide; and a sulfoxide that is selectively oxidize to a sulfone. The composition comprises a single molecule that is capable of reversible hydrogenation and oxidation, and dehydrogenated products selected from toluene/methylcyclohexane to benzaldehyde and benzoic acid, toluene/methylcyclohexane to benzaldehyde; fluorene/hexahydrofluorene to 9-fluorenone; diphenylmethane/dicyclohexylmethane to benzophenone; benzyl alcohol/cyclohexylcarbinol to benzoic acid; N-methyl carbazole/perhydro-N-methylcarbazole to N-formylcarbazole; bis(3-indolyl)methane/perhydrobis(3-indolyl)methane to bis(3-indolyl)ketone; acetone/isopropanol to acetone, or 2,4-hexanedione/2,4-hexanediol to 2-hydroxy-4-pentanone. The molecule comprises fluorene, diphenylmethane or toluene. Preferred Components: The second component comprises at least one member selected from an activated hydrocarbon, a primary or secondary alcohol, a primary amine, a tertiary amine or a sulfide. The composition comprises a hydrogen releasing molecule comprising at least one member selected from i) a single six-membered ring; ii) linked six-membered rings; iii) fused six-membered rings; iv) fused six-membered or v) five-membered rings. The foregoing items i) through v) further comprising at least one nitrogen or oxygen heteroatoms. The hydrogen releasing molecule and dehydrogenated molecule comprise at least one member selected from benzene/cyclohexane, toluene/methylcyclohexane; naphthalene/decahydronaphthalene; methylnaphthalene/decahydromethylnaphthalene; terphenyl/perhydroterphenyl; N-methylcarbazole/perhydro-N-methylcarbazole; N-ethylcarbazole/perhydro-N-ethylcarbazole; fluorene/perhydrofluorene; acetone/isopropanol; or 2,4-hexanedione/2,4-hexanediol. Preferred Method: The oxidation temperature is greater than the dehydrogenation temperature. The oxidation is conducted in the liquid phase or gas phase. The dehydrogenation is conducted in the liquid phase or gas phase. The process of releasing hydrogen and generating heat further involves hydrogenating the composition. EXAMPLE - A sample of 4,7-phenanthroline was catalytically hydrogenated (4% rhenium/lithium aluminate catalyst, hydrogen pressure of 800-900 psia) to yield 77% perhydro-4,7-phenanthroline and a distribution of lesser hydrogenated components i.e. perhydro-4,7-phenanthroline (77%), octahydro-4,7-phenanthroline (18%), decahydro-4,7-phenanthroline (3%), and tetrahydro-4,7-phenanthroline (2%). This mixture was then catalytically dehydrogenated under 1 atmosphere hydrogen pressure using a 5% palladium on carbon catalyst. The mixture was heated with heating by temperature ramping (5 degrees C/minute) of 25-200 degrees C, then held at 230 degrees C for 7 hours. An average product distribution over four runs afforded the product distribution of tetrahydro-4,7-phenanthroline (52%), 4,7-phenanthroline (27%), dihydro-4,7-phenanthroline (8%), and perhydro-4,7-phenanthroline (13%). An oxidative dehydrogenation of this partially dehydrogenated perhydro-4,7-phenanthroline was then performed as follows. The dehydrogenated perhydro-4,7-phenanthroline latter mixture (22 g) and ruthenium on alumina (Engelhard, 5% ruthenium) (6.2 g) were charged in a 50 ml 3-neck round bottom flask equipped with a distillation column for removal of water, an overhead stirrer and a syringe needle for purging air through the slurry. The flask was then heated to 230 degrees C and maintained at this temperature for 6 hours under an air purge with stirring. After cooling to room temperature, the slurry was taken up in tetrahydrofuran was used to dissolve the organic products and the catalyst was removed by filtration. The organic products obtained showed 14% conversion by oxidation with 98% selectivity. The composition of the product mixture comprised of tetrahydro-4,7-phenanthroline (45%), 4,7-phenanthroline (46%), dihydro-4,7-phenanthroline (6%) and perhydro-4,7-phenanthroline (3%).