Research efforts are currently devoted to hydrogen storage in CO 2 as formic acid derivatives, a thirty-year old idea [1] not yet implemented. A chemical loop is conceivable based on a formate intermediate which can be produced in a pure and storable form under moderately high CO 2 and H 2 pressures and which can release gases at atmospheric pressure on demand when in contact with an appropriate catalyst. The catalytic decomposition of HCOOH itself has received renewed attention.[2] Remarkably, M. Beller and co-workers have demonstrated that HCOOH/NEt 3 adducts can also be catalytically decomposed at 40 8C to H 2 free of CO, albeit diluted by CO 2 .[3] However, a procedure for the production of either HCOOH or HCOOH/NEt 3 adducts from CO 2 and H 2 is still lacking. The formation of HCOOH by CO 2 hydrogenation is hampered by unfavorable thermodynamics (DG o 298 = + 33 kJ mol À1

AUROlite besteht aus Titandioxid‐fixiertem Gold (das Bild zeigt Extrudate in einem Stahlgitterkorb) und ist ein robuster Katalysator für die Produktion von katalysatorfreien HCOOH/NEt3‐Addukten ausgehend von H2, CO2 und lösungsmittelfreiem NEt3. Durch Aminaustausch wird reines HCOOH aus den Addukten freigesetzt.

Beyond nanopowders: Hydrogen and formate are produced through the oxidation of alkaline HCHO by CuO microparticles. The Cu microparticles formed in the purely electrochemical reduction of CuO preserve the morphology of CuO (left-hand image: CuO; right-hand image: Cu formed in the reduction of CuO by alkaline HCHO) and can be permeated by a gas. They react more efficiently than Cu nanoparticles with air to restore CuO.

Research efforts are currently devoted to hydrogen storage in CO 2 as formic acid derivatives, a thirty-year old idea [1] not yet implemented. A chemical loop is conceivable based on a formate intermediate which can be produced in a pure and storable form under moderately high CO 2 and H 2 pressures and which can release gases at atmospheric pressure on demand when in contact with an appropriate catalyst. The catalytic decomposition of HCOOH itself has received renewed attention.[2] Remarkably, M. Beller and co-workers have demonstrated that HCOOH/NEt 3 adducts can also be catalytically decomposed at 40 8C to H 2 free of CO, albeit diluted by CO 2 .[3] However, a procedure for the production of either HCOOH or HCOOH/NEt 3 adducts from CO 2 and H 2 is still lacking. The formation of HCOOH by CO 2 hydrogenation is hampered by unfavorable thermodynamics (DG o 298 = + 33 kJ mol À1

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